I L j The Demands for Sterilization. n. A New Combination Sterilizer for Asepticizing simul- taneously Water, In- struments, and Dressings. BY FRANK J. THORNBURY, M. D., Demonstrator of Bacter'ology, Medical and Dental Departments, University of Buffalo. RETBINTED FROM THE Neto ¥or!t fHeDical for December 31, 1893. from the New York Medical Journal for December 31, 1892. THE DEMANDS FOR STERILIZATION* By FRANK J. THORNBURY, M. D., DEMONSTRATOR OF BACTERIOLOGY, MEDICAL AND DENTAL DEPARTMENTS, UNIVERSITY OF BUFFALO. Water from the interior of the earth, such as that ob- tained by artesian wells, is entirely free from germs, but water which stands or flows over the bacteria-enriched ground contaminated through decomposed organic mate- rial contains myriads of living organisms. The numbers of bacteria present fluctuate between the few to the cubic centimetre contained in ordinary well and spring water to the millions to the cubic centimetre found in river and canal water. For a long time it has been the popular belief that water might be the source of various forms of infection, and with our present understanding of intestinal mycosis we know that not only cholera and typhoid but many other serious alimentary diseases are directly traceable to this source. It is true that the water bacilli are for the most part those which do not belong to the germs of wound infection, although some most virulent varieties of bacteria have re- peatedly been found in water. * Read before the Buffalo Academy of Medicine, October 4, 1892. Copyright, 1892, by D. Appleton and Company. 2 THE DEMANDS 10R STERILIZATION. It is only necessary to recall the fact that the most dis- astrous of the animal septicaemias-namely, the rabbit sep- ticaemia bacillus discovered by Koch and Gaffgy-was first found in a tributary of the Spree River, flowing through Berlin. Rinantro Mori has isolated from canal water three patho- genic bacteria. According to Lortet and Despeignes, the Rhone River water of Lyons contains scarcely anything ex- cepting organisms which are pathogenic. The filter residue and precipitate injected subcutaneously into guinea-pigs caused a rapidly fatal septicaemia and pyaemia. Repeatedly the presence of pyogenic staphylococci has been detected in the examination of river and well water. With a knowl- edge of the virulent characteristics of these bacteria such water would be drank with much hesitation. The hydrant water of Freiburg, Germany, frequently contains the green pus Bacillus pyogenes. Most bacteria can maintain their vitality for weeks and even months in water. The water serves as a culture medium for many; they thrive and multiply in it by spontaneous proliferation. The bacteriological tests of Cramer showed that Zurich hydrant water increased twenty-seven thousand times in its septic contents after standing for twenty-four hours. And Leon ascertained that the supply water of Munich, which contained only five bacteria to the cubic centimetre, after standing for five days showed five hundred thousand germs to the cubic centimetre. Certain of the saprophytic bacteria grow best in water, and they here come to a luxuriant development. Accord- ing to Wolffhugel and Ridel, sterilized river water mixed with distilled water is a favorable nutrient medium for an- thrax, and Gioxa has shown that this is true of other patho- genic bacteria which are of interest to us aside from an- thrax. THE DEMANDS FOR STERILIZATION. 3 Reference to the chart prepared by Iloulwa giving re- sults of his investigations into the water supply of the city of Breslau is quite sufficient to convince us of the multi- plicity of forms of animal life found in water. It is conclusively demonstrated that water may be a source of danger from hygienic and bacteriological stand- points. It seems positively unjustifiable to permit its ap- plication to wounds without first subjecting it to a thorough sterilization. While we can hardly as yet sterilize the entire water supply of a city, demonstrated facts in hygiene demand that we sterilize the water used about operations-i. e., in cleans- ing the hands of the operator, the field of operation, the in- struments, and the utensils. Precipitation by the addition of some finely powdered and insoluble substance, filtration by use of sand or the Pasteur-Chamberlain filter, then destroying the germs by the addition of antiseptics, and finally sterilization by heat, are the various means of rendering water fit for surgical use. When water is allowed to stand for a time, of course the bacteria settle to the bottom in accordance with the laws of gravity. The precipitation may be further facilitated by the addition of sand, calcium carbonate, or certain other finely granular substances. Regarding filtration, by reason of the fact that water in the interior of the earth is free from bacteria, it has been thought that we might imitate Nature in so far as to be able to extract from hydrant water its germs and impurities by a process of filtration ; but such a degree of perfection we have, unfortunately, as yet not been able to attain. The Pasteur-Chamberlain filter, while valuable and ca- pable of markedly improving the quality of the water, does not render it absolutely free from bacteria. Perhaps for the first four or five days there are no germs present and it 4 THE DEMANDS FOR STERILIZATION. functionates fairly well; but after this time thg quantity of water which the filter will allow to pass gradually dimin- ishes, the pores become partially occluded, and finally germs filter through. The antisepticizing of water by the addition of chemical substances merits just a few explanatory statements for the correction of certain erroneous ideas which I believe to exist. Bichloride of mercury does not insure immediate death of everything in the way of germs, as ordinarily supposed. Staphylococcus pyogenes and Bacillus pyocyaneus live for a quarter of an hour in a one-per-cent, solution. Anthrax spores resist a one-per-cent, solution for twenty-four hours. Boric acid, ammonia, and absolute alcohol have little influ- ence upon them. They survive a five per-cent, carbolic so- lution for days. Tetanus, tubercle, and spores of other pathogenic bacilli present similar degrees of resistance. Clear spring water, in which the individual bacilli are suspended isolated, may be disinfected, but the highly con- taminated water of rivers and ponds, containing gross visi- ble masses of impurity rich in bacteria, does not admit of being rendered sterile by the addition of antiseptics. Heat is the only absolute agent-simple in its application, most rational and reliable. The spores of anthrax, the most re- sistant pathogenic spores known to us, are completely de- stroyed by boiling in water for three minutes. Five min- utes of boiling them must remove every reasonable possi- bility of any germs remaining alive. Aliquel found that of one thousand bacteria in water, 95'5 per cent, were destroyed by short boiling. Water of the river Rhone, which contained thirty-three thousand bac- teria to the litre as revealed by the investigations of Lortet, lost through boiling all but nine hundred and forty-one bac- teria, or over ninety-seven per cent. Bacteria which resist THE DEMANDS FOR STERILIZATION. 5 boiling water are only such as possibly the hay bacillus- i. e., non-pathogenic, and consequently unimportant. The absolute certainty of heat sterilization and its readi- ness of application strongly makes it desirable that every surgeon shall provide a sufficient quantity of sterilized wa- ter for use in his operating room or clinic. And as there are bacteria that thrive and multiply in water, it is neces- sary that after boiling it be closed hermetically, or, prefera- bly, boiled fresh each time it is needed. Sterilizing in bottles is only adapted to limited use; for hospitals and clinics and general operative purposes a spe- cial apparatus is necessary. The relation of cause to effect existing between the occasional occurrence of abscesses in association with hy- podermic injections has been recognized since an early pe- riod in the use of the hypodermic syringe. We have the one instance in which four consecutive tabes patients were inoculated with erysipelas and three of them died. Two typhoid patients in a state of collapse de- veloped rapidly fatal purulent oedema following injection of tincture of musk. Two cases of fatal phlegmon resulted from the subcutaneous administration of quinine (Leyden's clinic, Charite, Berlin). The inoculation of anthrax in the injection of a solu- tion of arsenic has been observed in the Breslau clinic of dermatology. Two cases of tuberculosis are lately recorded, one by Kbnig and the other by Eiselsberg. There has been in general too little attention given to the liability of the presence of organisms in injected fluids. Schiinmelbusch and Hohl have shown that the hypodermic solutions obtained from various apothecaries' shops in Ber- lin contain vast numbers of live bacteria. The germs present in a one-per-cent, pilocarpine hydrochloride solution were innumerable. In an ordinary solution of ergotine there were 6 THE DEMANDS FOR STERILIZATION. ten thousand bacteria to the cubic centimetre. Solutions of atropine, morphine, and cocaine hydrochloride also were rich in organisms. It is quite important that we should recognize that the pus formers-the Fehleisen erysipelas streptococcus and other pathogenic organisms-multiply in the fluids which we are injecting into the body. Ferrari has recently shown that in one-per-cent, solu- tions of morphine and atropine the organisms not only live for weeks, but indeed increase with marvelous rapidity and form pure cultures in the fluid. In glycerin the Staphylococcus pyogenes aureus remains alive and active for six days, then gradually dies. In two- per cent, morphine solutions it retains its vitality for twenty- four hours ; in ten-per-cent, cocaine solutions for two hours. Only in the stronger solutions-such as those of ether, musk, quinine bisulphate, fifty-per-cent, antipyrine, and twenty- per-cent. caffeine benzoate-does it die at once. In 045 to 30'0 per cent, strychnine sulphate bacteria live for eight days. In one-per-cent, hydrochloride of cocaine, after nine days, thousands were still alive. That the subject of the bacterial contamination of hy- podermic solutions and the consequent danger of subcuta- neous medication merits some attention, therefore, must be conceded. Not only should we sterilize prepared hypodermic solu- tions and use sterilized water in dissolving morphine and other tablets, but the syringe and needle also should be sterilized. Five minutes' submersion in boiling water suffices to ren- der the instrument aseptic. The fluid may be heated in a test tube over the gas or lamp flame. The mechanical cleansing, which should constitute the preparatory part of every sterilizing procedure, for re- THE DEMANDS FOR STERILIZATION. 7 moval of the grosser contamination-such as dried blood, pus, and masses of fat-does not, of course, insure an abso- lute asepsis. The instruments will often still be found to contain many varied forms of micro-organisms strewn promiscu- ously over their surface. For the removal of this final but important source of error the impracticability of the successful use of carbolic, boric, or salicylic acid solutions, or even bichloride of mer- cury, by pouring one of the latter over the instruments for a few minutes, is proved by the foregoing references and demonstrated facts. The instruments must be sterilized, and the choice of method lies between hot air, steam, and boiling solutions. Only the latter of these shall I consider. Spores of many bacilli resist hot air at 140° for two hours and steam for forty minutes to an hour, while boiling in soda insures abso- lute death of even anthrax spores in from three to five minutes. Catheters, sounds, and bougies also merit some attention, since it has been proved that most cases of severe cystitis are due to the introduction of germs into the bladder by unclean instruments. The urine in the healthy bladder is normally free from bacteria, and decomposition does not occur without external cause. There are few practitioners who have not observed the development of cystitis after a single urethral exploration or repeated catheterism. Rosving has found frequently staphylococci and streptococci identi- cal with known pathogenic species in aetiological association with vesical inflammations. In thirteen cases out of twenty of purulent cystitis, the younger Schnitzler was able to trace the cause to a certain bacterium, which he names Urobacil- lus pyogenes septicus. By the introduction of his Urobacillus pyogenes septicus into the healthy bladder of animals, Schnitz- ler was able to produce the most virulent cystitis. 8 THE DEMANDS FOR STERILIZATION. It is not sufficient for disinfection to simply dip the sounds, catheters, and bougies into antiseptic solutions or lubricating oils. Many of these combinations themselves contain live bacteria. Koch long since demonstrated that antiseptic oils were, to say the least, ineffectual. In the first place, the chemical substance does not dissolve thoroughly in the oil. Second- ly, the oil does not permeate the septic material. Silk threads, impregnated with pus and then dipped into oil, may be submerged in a l-to-200 corrosive-sublimate solu- tion for days and weeks without injuring the bacteria. Analogous instances are found in attempts at destroy- ing the bacteria imbedded in the sebaceous secretions of the skin and in the fat of the skin and of lubricated catheters. Thus we see the absurdity of simply washing the hands superficially or rinsing them in bichloride, and also the uncertainty of attempts at sterilizing catheters by sim- ply dipping them in carbolized or other " antiseptic " oil. The same also applies to the preparation of catgut by the popular method of " carbolizing " it. The oil itself is not reliably sterilized by the addition of chemical substances, as shown in the foregoing statements. The same is true of water-antiseptic solutions. Sounds, of course, admit of being sterilized in heat, the same as other metal instruments; so also do Albarran's caoutchouc catheters. The soft-gum and lac catheters do not tolerate boiling, however; consequently they maybe continuously submerged in strong carbolic-acid or corrosive- sublimate solutions-our next best substitutes-although each time before being introduced they should be rubbed with sterile gauze, or washed in sterilized water, to re- move the antiseptic, which is very irritating to the urethral canal. The rubbing in itself is an efficient mechanical asep- tic, as shown by Schimmelbusch, who infected red lac THE DEMANDS FOR STERILIZATION. 9 catheters with pure cultures of various bacteria, and found that, after a minute of active rubbing with moist, then dry, sterile gauze, the instruments were completely sterilized. We have the two associated factors of friction and heat as explanatory. Regarding the cleansing of the hands, above incidental- ly referred to, they, of course not being sterilizable, should be treated with soap and brush, ether, alcohol, or corrosive sublimate, using sterilized water. But the brushes them- selves must be kept clean, otherwise they may be a source of danger. Used in removing blood, pus, surface epithe- lium, and all forms of contamination, they become more or less contaminated themselves ; being moist, they retain most of the albuminous matter, and form a most excellent nidus for germs. Schimmelbusch and Spielhagen, in repeated examinations of the nail-brushes in clinics, dissecting-rooms, and labora- tories, found in them inestimable myriads of bacteria. That the brushes, therefore, merit some attention must be conceded. In the von Bergmann clinic they are dealt with in the following manner : Before being used they are first sterilized in steam for thirty minutes; second, they are kept continually submerged in a half-per-cent, corrosive sub- limate ; third, after a special contamination they are placed in very hot and finally in boiling water. In every commode there should be a receptacle in which the brush can be kept submerged in the bichloride. The latter will maintain asepsis after the brush has been steril- ized by boiling. Sponges are proverbially a source of danger, and twenty per cent, of those prepared for use in Billroth's clinic were found by Frisch to contain bacteria. Absorbing so freely into their intricate capillary network blood, pus, and all fluids, contaminated or not, they are, a priori, apt to retain THE DEMANDS FOR STERILIZATION. 10 and convey infection and permit only with difficulty of be- ing sterilized. Anthrax spores are found in sponges after being fourteen days submerged in carbolic acid. The or- dinary organisms live for eight days. But it is difficult to dispense with sponges entirely, es- pecially in operations about the mouth, resections of the jaw, etc., and laparotomies. And they may be sterilized if heat is employed. The method practiced by Schimmelbusch consists in first washing them thoroughly in hot water, removing carefully all foreign matter. After several rinsings they are boiled for thirty minutes in a one-per-cent, soda solution, then pre- served in strong corrosive-sublimate solution. This method may be regarded as absolute. Sponges impregnated with pus and anthrax spores did not react to culture efforts after ten minutes in the boiling soda. Since it has been shown that raw catgut is rich in bac- teria, and Volkmann has had two cases of anthrax develop in a wound sutured with ligature from the sheep, in which ani- mal anthrax is common ; further, by reason of Koch's hav- ing demonstrated that antiseptic oils are ineffectual, as above shown-we are required to put catgut and other suture ma- terials also through a course of sterilization. Steam for the silk is best, and Schimmelbusch's spool boxes, in which the ends of the threads protrude from the side, may be used. For preparing the catgut, von Bergmann's method is best: First, the bottle is sterilized for three quarters of an hour in steam; second, there is a process of deoleation by plac- ing the catgut for twenty-four hours in ether ; third, there is a submersion in alcohol and corrosive sublimate of the following proportions: bichloride, 10'0; absolute alcohol, 800-0 ; aq. destillata, 280'0. The subject of drainage-tubes merits a passing notice. The necessity of their being sterile requires no argument. THE DEMANDS FOR STERILIZATION. 11 The glass and rubber tubes may be boiled in soda or steril- ized in steam. Five minutes of the former, fifteen or twenty of the latter, is sufficient to render them reliably aseptic. All of the articles and materials used in the disinfection of the surfaces, cutaneous and mucous, must of course them- selves be aseptic. The alcohol, ether, and turpentine oil are kept free from bacteria only by careful handling. Eiselsberg showed in 1878 that soap was richly impreg- nated with micro-organisms, and only that which had been boiled in the process of its manufacture should be used. Last, but none the less important, we have the dressings to speak of. Sterility as a prerequisite is absolute, and this applies to everything that is to come in contact with pure, fresh wounds. Both Schlange and Loffler have found gauze band- ages, etc.-factory supplies-to contain many germs. The necessity of sterilizing the dressings then follows as a natu- ral consequence. Saturating them with antiseptics is inef- fectual. We now know that the action of most chemical solutions must continue for a long time, often for days, before certain resistant spores are destroyed, and the effect may at best be entirely nil when there are present the more or less impermeable layers of fat and albuminous substances in which the bacteria are often imbedded. Even though it be conceded that the gauze and other materials have been sterilized by the transitory and more or less imperfect saturation with some of the popular antisep- tics-carbolic acid, boric acid, or corrosive-sublimate solu- tions-as the work is done in the manufactory, they would be afforded innumerable opportunities for reinfection in the subsequent handling by three or four different persons, in cutting, folding, and packing the dressings for shipment, and the reverse of this process after they had reached the surgeon. Further, it is not with bouillon or water that we 12 TIIE DEMANDS FOR STERILIZATION have to deal in a wound, but rather with albuminous culture material, which decidedly limits the action of chemicals. Combinations form, reducing the effectual working of the carbolic acid, corrosive sublimate, and other agents, and more or less evaporation occurs. In sublimated gauze, after a time only an insignificant trace of the original anti- septic is to be found. In solution also the bichloride is changed by the alkaline earths of ordinary water, although the combinations may to some extent be obviated by the addition of an equal quantity of chloride of sodium. Thus wTe see the unreliability of antiseptic asepsis in dressings, and the inconsistency of relying on factory-pre- pared supplies. Asepsis permanent and reliable, implying the avoidance of uncertainties and these various subsequent liabilities to contamination, may be accomplished in a simple manner by sterilizing the dressings by heat applied especially in the form of steam. Not only by reason of convenience and greater reliability in the absolute destruction of all patho- genic organisms does the steam sterilization recommend it- self over the impregnation with antiseptic agents, but fur- ther in that at any time, on short notice and in but a few minutes, the work can be executed. A secondary handling of the dressings is also obviated ; they are preserved in closed boxes, in which they remain until applied directly to the wound-i. e., they are made ready for use before being put into the sterilizer. The bandages are rolled, the cotton is cut into strips, and the gauze is divided into such lengths as may be desired. The whole is then put into the small box receptacles and sterilized with lid and bottom orifices open ; afterward they are dried and tightly closed. The dressings are then protected from every source of contact and contamination and there is no further handling of them until they are applied directly to the wound. THE DEMANDS FOR STERILIZATION. 13 This principle of closed boxes for dressings is especially important and is infinitely more reliable than the storing of dressing in drawers, closets, or other less cleanly places (Schimmel busch). With reference to the heat sterilization of the metal in- struments, I wish to lay special stress upon the use of the boiling soda solution. First introduced into practice by Davidsohn in a contribution from the Koch laboratory about two years and a half ago, it has gradually gained ground until it has attained the present distinction of being our most valuable and powerful disinfecting agent. Other alka- lies had been added to the boiling water to supplement its sterilizing action, such as chalk, chloride of sodium, and caustic soda, but none of these have been found to possess the saponifying and permeating value of the washing soda. Its use in household practice -for dissolving away dirt and for cleansing purposes generally is the most forcible argu- ment in its behalf. Simple boiling water is in itself decid- edly superior to either hot air or steam, as it destroys in five minutes the most resistant micro-organisms. But the in- struments rust if boiled simply in water, especially if the water is cold when they are put into it, while by the use of soda, with the additional precautions of rubbing and dry- ing the instruments, the rusting may be avoided. The ster- ilizing action of the boiling water is further intensified by the dissolving action of the soda. " We may say the boil- ing soda solution forms the most powerful disinfecting agent known to us, the use of which is applicable in practice. Silk and heavy wool threads impregnated with pus and pure cul- tures of the Staphylococcus pyogenes and Bacillus pyocyaneus are invariably destroyed in two to three seconds, and an- thrax spores in two minutes, by submersion in the boiling soda solution " (Schimmelbusch). The imperative necessity of sterilizing practically every 14 THE DEMANDS FOR STERILIZATION. article of the surgeon's paraphernalia being now understood, the demand for a single apparatus in which all the work can be accomplished naturally suggests itself. This indi- cation I hope to have fully met in the combination steril- izer which I have the pleasure to present with illustration in this issue of the Journal (see New Inventions). Appa- ratuses have been devised for sterilizing water, there is a useful apparatus for instruments, and others have been devised for sterilizing dressings, but a combination appa- ratus in which all these three purposes can be accomplished in one has not as yet, to my knowledge, been invented. The necessity for such an apparatus seems to be very positive, as most practitioners can not well have three sterilizers- one for water, another for instruments, and another for dressings. If all these requirements could be combined in one apparatus, however, made of proper proportions and inexpensive, it would naturally come within reach of a greater number of those requiring a sterilizer. The num- ber who do require a sterilizer corresponds with the num- ber who make any pretensions to doing surgical work. My special aim in the designing and execution of this apparatus* has been to bring it within reach of the general practitioner; its construction and use are simple and it may be arranged for working in almost any office. Where gas is not used the alcohol lamp may be employed for heating, but the supply bottle should be placed to one side and the wicking conducted through a tube to supply the liarae underneath the boiler; thus the danger of an explosion by the boiling point of the alcohol becoming reached is obvi- ated. * Obtainable from Jeffrey & Gotshall, Buffalo, N. Y. A NEW COMBINATION STERILIZER FOR ASEPTICIZING SIMULTANEOUSLY WATER, INSTRUMENTS, AND DRESSINGS. By FRANK J. THORNBURY, M. I). DEMONSTRATOR OF BACTERIOLOGY, MEDICAL AND DENTAL DEPARTMENTS, UNIVERSITY OF BUFFALO. This apparatus is designed to meet the requirements of the general practitioner as well as the specialist in surgery, obstet- rics, and gynaecology. It consists of a boiler (J9) in which the water is sterilized, a tray (C) containing soda solution in which the instruments are sterilized, and an upper chamber (2T) for sterilizing the dress- ings. The steam for the latter is generated in a jacket of water (A), which envelops the lower boiler and upper instrument tray. The dressing chamber is provided with double walls separated by a space a few centimetres in width, and corre- sponding to the outer water compartment below. Through the upper intervening space steam ascends from the water jacket to enter, through a line of perforations, the inner chamber at the top. Hot air passes up around the dressings through the outermost space (A"), so they are warmed before the steam en- counters them. The water jacket extends from the bottom of the water boiler on all sides upward to the top of the instru- ment tray. It has drain (A) and inlet pipe ((?) attached. The inner walls of the water jacket form the walls of the boiler for sterilized water on four sides and below. Resting into the 16 A NEW COMBINATION STERILIZER. boiler above is the shallow instrument tray with soda solution. The cover of the tray is formed by the bottom of the removable chamber for dressings above. In the latter are contained two sub-compartments (FF)- small closed boxes-with two rows of perforations in the top and bottom, left open for entrance of steam while the dressings are sterilizing, afterward closable to preserve them uncontami- nated. The communication between the top of the jacket and the outer steam compartment of the upper chamber is direct • in fact, what is the water jacket below corresponds with the outer steam space above. The steam, after permeating and trav- ersing the dressings, gauze, cotton bandages, etc., contained in the boxes in the upper chamber, escapes through a vapor pipe at the side into the open air, or may, in case of an apparatus of large proportions, be conducted through a coil of lead pipe to be condensed in a vessel of cold water. Supply and drain pipes are provided to the water boiler so that it may be tilled, or sterilized water drawn off, as desired. The whole apparatus is closed at the top by a tightly fitting cover which sets into a water seal around the periphery. A, water jacket; B, water boiler ; C, sc da tray ; I), instrument tray ; E, upper steam chamber; F> boxes for dressings ; G, supply pipe to boiler ; H, tap to sterilized water boiler; I, faucet to water jacket; J, gas supply pipe ; K, hot-air chamber. A thermometer for registering the temperature in the steam chamber projects through the cover in the center. The tem- perature will be found to be uniformly 100° C. in the steam chamber and 104° 0. or more in the boiling water and soda. The apparatus is heated by means of a gas pipe (<7) running A NEW COMBINATION STERILIZER. 17 underneath and containing a number of jets so that the heat may be distributed over as great an extent of surface as possi- ble. Owing to the compactness of the apparatus, its compara- tively small size, and the provision for rapid heating, the entire sterilizing process occupies but a short time. The water and soda are boiled in three to five minutes-the instruments sterilizing in the soda-the upper chamber is filled with steam in twelve minutes, and in twenty-eight minutes the dressings are sterilized. Two boxes of dressings may be sterilized at one time, and in the intervals a quantity sufficiently large to last for a number of operations, so that, in case of emergency and want of time, only a delay of about ten minutes is occasioned. This short time for sterilizing the instruments and water may be made to occupy the interval of details preliminary to the operation. The dressings, after having been asepticized, are removed in the small boxes (no secondary handling and contamination being permitted) and allowed to dry out, although there has not been much saturation through condensation, owing to the dressings having been warm before the steam encounters them. They set directly over and rest upon a tray of hot soda solution. Secondly, the steam is generated rapidly, is saturated and under considerable tension, and consequently has not much tendency to condense on the articles. To cause evaporation of any moisture that may have oc- curred, however, and dry thoroughly the dressings so they may be preserved for future use, hot air may be passed through them in a manner to be hereafter described. The dressings, hav- ing been sterilized and dried, keep aseptic indefinitely in the tightly closed boxes. One of the latter may be taken by the surgeon to cases in private practice, sterile gauze being thus con- stantly at band. In using this combination sterilizer,* first the boiler is filled with water; second, a one-per-cent, soda solution is placed in the tray, and in the latter the instruments are sub- merged in a shallow wire basket (7>). Next the boxes are filled with dressings (leaving the cover and bottom orifices open) and * Obtainable from Jeffrey & Gotshall, Buffalo, N. Y. 18 A NEW COMBINATION STERILIZER. set into the sterilizing chamber. Water is now allowed to flow from the hydrant to fill the jacket, and then the gas is turned on. After the sterilizing process is completed the water is drawn from the jacket through a faucet at the side, and water from the hydrant is allowed to course through around the sterilized water in the boiler, cooling it for immediate use. The instruments have been sterilized in the soda which has boiled, and are now taken out and set into a tray containing a cold solution of carbolic acid and soda, one per cent. each. The gas flame allowed to continue generates dry heat (the jacket being empty), which takes the same course to dry the dressings as the steam did in sterilizing them. This constitutes the apparatus and its working complete. I desire to express my thanks to Mr. Charles Jeffrey, of Jef- frey & Gotshall, and also to Mr. I). McAvoy, draughtsman, for valuable aid and suggestions in perfecting my design. I am in- debted to Mr. Jeffrey for its execution. 610 Main Street, Buffalo, N. Y.