>7jC VJC;I^~T1 ”"’—~| ''pr^;'"11 ■■'■?:"■=1 -v-a::., - •^0i|PjJ:L7\R;;EDUCAfTiQ.NAL SERIES ' -/-Lr ' v ‘‘WhQ&cT - • nxZni/s l:f^r— IR, AINSWORTH $ DM FIRST LESSONS Physiology i-Hygiene WITH SCIENTIFIC INSTRUCTION CONCERNING THE PHYSIO- LOGICAL EFFECTS OF ALCOHOLIC STIMULANTS AND NARCOTICS ON THE HUMAN BODY. A TEXT BOOK FOR THE COMMON SCHOOLS. By THOMAS H. DINSMORE, Jr., Ph. D. Processor of Physics and Chemistry in the State Norm^^^omol, Emporia, Kansas. PUBLISHED BY FT7TTER, AINSWORTH & CO,. New York, Boston, Chicago. Copyrighted 1885, BY Thomas H. Dinsmore, Jr. PRESS OF Liberty Printing Company, 107 LIBERTY ST., N. Y. INTRODUCTION. It has been the hope of the writer in preparing this little volume to make it so clear and simple that the pupils, even in the primary schools, may be able to understand both the language used and the thoughts expressed. Educators have found that young children become confused and discouraged when they are expected to study several pages of solid matter and discern the important parts, but that the pupils remember well what is told them on the same subject. This work has, therefore, been written as a series of questions and answers. It is thought that the questions chosen are such as would naturally arise in the minds of parents, teachers and others when inquiring for information on this important subject. The effects of alcoholic stimulants and narcotics upon the human body have been described as directly and impartially as possible. The simple truth concerning the terrible effects which follow the use of alcoholic stimulants is enough to cause the student to turn away from alcohol with a shudder. iv INTRODUCTION. Review questions are frequently given, with additional inquiries, in order that the truth may be more forcibly impressed upon the mind. The portions of the manuscript relating to the physiological effects of alcoholic stimulants upon the human body have been read and discussed at the meeting of York County Medical Society; and the writer would hereby express his grateful acknowledgment to the members of the society for the lengthy discussion of the papers, also for valuable suggestions offered and the kind endorsement of the work given for publication. York, Pa., June, 1885. T. H. D, Jr. NOTE. For the temporary use of the cuts in this work the author is indebted to the courtesy of A. S. Barnes & Co., publishers of Steele’s Hygienic Physiology. AUTHORITIES USED FOR REFERENCE. (1) BARTHOLOW, Dr. ROBERTS. Materia Medica and Ther- apeutics. (2) CARPENTER, Dr. W. B., F.R.S. Alcoholic Liquors. (3) GREENFIELD, Dr. W. S. Alcohol: Its use and abuse. (4) JOHNSON, Prof. J. F. W., F.R.C.S. The Chemistry of Com- mon Life. (5) MARTIN, Dr. H. N. The Human Body. (6) RICHARDSON, Dr. B. W., F.R.S. Alcohol on the Body and Mind. (7) RINGER, Dr. SYDNEY. Hand-book of Therapeutics. (8) TAYLOR, Dr. A. S., F.R.S. A Treatise on Poisons. (9) THE- PHILADELPHIA MEDICAL TIMES. (10) THE YORK (PA.) COUNTY MEDICAL SOCIETY. (ix) YEO, Dr. GERALD F., F.R.C.S. Manual of Physiology. (12) CARPENTER, Dr. W. B. Mental Physiology. At a stated meeting of the “York County Medical Society,” held in the Hospital and Dispensary building at York, Pa., on May 7th, 1885, the following resolution was unanimously adopted : Resolved, That the members of this Society, having this day heard and discussed the papers by Prof. T. H. Dinsmore, Jr., relating to the Physiological effects of alcoholic stimulants upon the stomach, liver, heart, circulation, kidneys, brain and other parts of the human body, do endorse the same as being clearly expressed, medically correct, and in entire accord with our experience as practitioners. Samuel J. Rouse, Secretary. W. T. BACON, President. I have reviewed the manuscript of the “ First Lessons in Physiology and Hygiene,” by Prof. Thomas H. Dins- more, Jr., and pronounce it the best I have seen on the subject. The plan of the work is such as to lead the pupils gradually onward. The thoughts are couched in the plain and easy language that pupils can remember, and the information concerning the effects of alcohol upon the human system is valuable. E. W. SOUTH, M.D. Plainfield, N. J., August i, 1885. CONTENTS. PAGE. I. Kinds of Life 13 II. Divisions of the Body, 14 III. The Skeleton, 16 IV. The Number of Bones, 17 V. The Bones of the Trunk and Arms, ... 20 VI. The Bones of the Legs, 22 VII. Different Kinds of Bones, 24 VIII. The Flesh—The Skin, . . . . .25 IX. The Hair and Nails, 27 X. The Muscles and Tendons, 29 XI. The Joints .31 PART FIRST. PART SECOND. XII. Hygiene, 37 XIII. Kinds of Food, 39 XIV. Food and Drink—Continued 41 XV. Bathing. .42 XVI. Clothing, 44 XVIl. Exercise, 45 XVIII. Work, Rest, 49 XIX. Ventilation, 50 VIII CONTENTS. PART THIRD. PAGE. XX. Alcoholic Stimulants, 59 XXI. Alcohol 60 XXII. Wines 62 XXIII. Fermented Liquors—Continued, .... 64 XXIV. Strong Drinks 66 XXV. Physiological Effects of Alcoholic Stimulants, 68 XXVI. The Stomach 70 XXVII. The Liver 74 XXVIII. The Kidneys 75 XXIX. The Blood—The Circulation, .... 77 XXX. The Circulation—Continued, 81 XXXI. The Lungs, . . 85 XXXII. Effects of Stimulants upon the Action of the Lungs, 87 PART FOURTH. XXXIII. The Nervous Organization, 93 XXXIV. The Effects of Stimulants upon the Mind, . 95 XXXV. The Eye, 101 XXXVI. The Ear, 104 XXXVII. Crime—A Visit to the Jail 106 XXXVIII. Exposure to Cold and Heat, .... 109 XXXIX. Narcotics, 116 XL. Opium, 121 CONTENTS. ix PART FIFTH. PAGE. XLI. General Effects, 131 XLII. Diseases Caused by the use of Alcoholic Stimu- lants, . . . . 132 XLIII. Alcoholic Liquors—as discussed by the Philadelphia County Medical Society, . . . . .134 XLIV. Study and Stimulants 139 XLV. Adulterated Liquors, 143 XLVI. The Children of Drunkards 146 XLVII. Wine for the Stomach’s Sake, 149 Suggestions to Teachers. The law of Pennsylvania states that the subject of Physiology and Hygiene shall be introduced and studied as a regular branch by all pupils in all departtnents of the Public Schools of the Commonwealth, and in all educational institutions supported wholly or in part by money from the Commonwealth.* It is suggested that in giving instructions from this work the pupils be arranged in two grades. Let those who are in the primary grade, after reaching Part Fourth, be excused from further study, except in the chapters on “ Narcotics” and “ Opium.” All pupils who have reached the age of ten or twelve years will be able to complete the full work each winter. Permit the writer, as a teacher, to suggest that it is better, especially in a new subject, to assign short and easy lessons than to risk discouraging your pupils by giving them more work to perform than they can master with pleasure, or accept with profit to themselves. The Author. * It will be seen from the above, that this work was prepared while the writer was occupying the chair of Natural Sciences in the York Collegiate Institute, more especially for use in the schools of Pennsylvania, but as the desire for instruction on this subject is becoming quite general, it is hoped that the (ruths herein expressed may find favor with educators in other States. PART FIRST. The Structure of the Body. FIRST LESSONS IN PHYSIOLOGY and HYGIENE. I.—KINDS OF LIFE. 1. Of what does Physiology treat? Of the action of the various parts of living bodies. 2. What are the living bodies ? Those which pass through a course of life and growth. 3. How are the living bodies divided ? Into plants and animals. 4. What are plants ? The kinds of life which spring up from the ground. They remain fastened to the earth and can neither see nor hear. 5. Give some examples of plants. Grass, flowers, wheat, corn and trees. 6. What are the main parts of a plant? The top, or branches, the stem and the root. 7. Do plants live only on the land ? They live both on the land and in the water. 8. What must plants have in order to live ? Earth, air, sunshine and water. 14 dinsmore’s first lessons 9. What are animals ? The kinds of life which, as a rule, move about on the earth and in the water, and the larger animals both see and hear, while man, who is also an animal, can speak. 10. Give some examples of animal life. Birds, dogs, sheep, horses and men. 11. What are the principal parts of such animals as those named ? The head, heart, stomach and feet. 12. Of what does the physiology, which is used in our schools, tell us ? Of the action of the parts of the human body. 13. What is the name of the book which describes the plant life ? It is called Botany. II.—DIVISIONS OF THE BODY. 1. What is a division of a body ? One of its parts. 2. What is a great division ? A large portion made up of smaller parts. 3. How many great divisions are there in the human body ? Three. 4. What are they ? The head, trunk and extremities. 5. What are the names of the principal parts of the head which may be seen ? IN PHYSIOLOGY AND HYGIENE. 15 (1)Thecrown, '8)forehead, (3)backof the head, (4)tem- ples, (5) eyes (6) nose, (1) mouth, (8) chin, (9) cheeks, and (10) ears. 6. What is the trunk ? The part from the head to the hips, not counting the arms. 7. What are the names of its parts ? The upper part is called the chest, and the lower part the abdomen (ab-do-men). 8. Has the chest within it one or more than one organ ? * It has two principal organs. 9. What are they ? The heart and lungs. 10. How many principal parts are there in the abdo- men ? Five. xi. What are they ? The stomach, liver, spleen, kidneys and intestines? 12. What are the extremities? The arms and legs, with the hands and feet. 13. Of what kinds of material is the body composed ? Of solid, partly solid, and liquid substances. 14. What are the solid substances ? The bones and teeth. 15. What are the partly solid substances ? The flesh and internal parts of the body. 16. What are the liquid substances? Water, blood, and other fluids. * An organ is a separate part. 16 dinsmore’s first lessons Questions. 1. Of what does Physiology treat? 2. What are living bodies? 3. What are the two great divisions of life ? 4. What is a plant ? 5. Can you name four kinds of plants not given in the book ? 6. What is an animal ? 7. Can each one in the class name a different kind of animal ? 8. Is man a plant or an animal ? Why ? 9. What are the three great divisions of the body ? 10. Can you tell the names of the different parts of the head ? 11. Is the heart in the chest or abdomen ? 12. Where is the stomach? 13. What are the extremities? III.—THE SKELETON. 1. How many bones are there in the human body ? Two hundred and six, not counting the teeth. 2. What name is given to all of the bones taken together ? The skeleton. 3. What is the purpose of the skeleton ? It serves as a frame-work for the support of the body ? 4. Of what are the bones composed ? The Skeleton. IN PHYSIOLOGY AND HYGIENE. 17 They are made up of about one-third part of animal and two-thirds mineral substances. 5. What is the name of the mineral which forms the principal part of the bone? Lime. 6. Are the bones hard or soft ? In childhood they are soft, but in old age they become hard and brittle. 7. What is a brittle substance ? One which breaks easily, as a tumbler, or a dish. 8. When bones are broken how do they grow together ? A thick fluid, like mucilage, forms all around the broken parts and gradually changes to new bone. 9. If the bones of a child and those of an aged person were to be broken at the same time which would grow to- gether first ? Those of the child. 10. Why ? Because the bones of a child, being softer, unite sooner than those of an aged person, which, as has been said, are hard, dry, and brittle. 11. When the bone is broken how long does it require for the parts to unite and become strong again ? From six to twelve weeks. IV.—NUMBER OF BONES—THE TEETH. i. How many bones are there in the head? Twenty-eight. 18 dinsmore’s first lessons 2. How many in the trunk ? Fifty-four. 3. How many in the extremities ? One hundred and twenty-four. 4. How many teeth are there ? Children under eight years of age have only twenty, known as the milk-teeth, while grown persons have thirty- two. 5. Are the teeth counted as bones ? They are not. 6. Of what are the teeth composed ? Of almost the same material as bone, except that the parts which we see are covered with a layer of a white substance, called enamel. 7. Is a tooth harder or softer than bone ? It is much harder, and where the enamel is, it is almost like flint, which is one of the hardest kinds of stone. 8. What are the teeth shaped like ? Those in the front part of the mouth are shaped like wedges, and are called the cutters, while the back- teeth arc large and flat, and are called the grinders. 9. How may the bones of the head be divided ? Into those of the skull, face and ears. 10. How many are there in the skull ? Eight. 11. How many in the face? Fourteen. 12. How many in the ears ? Three in each. IN PHYSIOLOGY AND HYGIENE. 19 13. Which of the bones of the head are easy to re- member ? * The frontal (or forehead), the nasal bone (in the nose), the cheek and jaw bones. Questions. 1. How many bones are there in the body ? f 2. What is the skeleton ? 3. Of what are the bones composed ? 4. Which are more brittle, the bones of children or those of old people ? 5. How long does it require for bones to grow together after being broken ? 6. How many bones are there in the head ? 7. How many in the trunk ? 8. How many in the extremities ? 9. Are the teeth counted as bones? 10. How many teeth should a person have who is five years of age ? 11. How many should a grown person have? 12. Is the skull in the upper or lower part of the head ? 13. How many bones are there in the skull ? 14. How many bones are there in the ear? 15. Are the jaw bones in the face or skull ? * The teacher will find it of great interest and advantage to have the pupils place their hands upon each bone as it is named. + Some writers think there are 208 distinct bones. 20 dinsmore’s first lessons V. —THE BONES OF THE TRUNK AND ARMS. 1. What are the principal bones of the trunk ? The backbone, breast-bone, ribs, and hip bones. 2. What is the backbone like ? It is called one bone, but it is made of small parts. 3. How many parts are there ? Twenty-six. 4. What are the parts called ? The vertebrae. 5. By what other name is the back- bone known ? The spinal column. 6. Describe the breast bone. It is a flat bone in the centre of the breast ? 7. What are the ribs ? Twenty-four curved bones, twelve on each side,which extend from the back- bone around to the front of the chest. 8. How are they held in front ? Seven on each side are fastened to the breast-bone, and are called true ribs ; while the others, which are called floating and false ribs, are held together by a tough sub- stance, called gristle. The spine: the seven ver- iebree of the neck, cervical; the twelve of the back, dor- sal; the five of the loins, lumbar. IN PHYSIOLOGY AND HYGIENE. 21 9. How many bones are there in the arm ? Thirty-two in each one. io. How is the arm named ? From the neck to the elbow is called the upper arm, from the elbow to the wrist, the fore-arm, and from the wrist it is called the hand. ix. What are the parts of the upper arm ? The collar-bone, which may be felt below the neck, the shoulder-blade, which is between the collar-bone and the shoulder, and the humerus, which is the long bone between the shoulder and elbow. 12. How many parts are there in the fore-arm ? Two, the radius and ulna. 13. How can you tell the radius from the ulna? When the arm is extended at full length, the upper bone is the radius. 14. Is it possible to feel both bones ? Yes, by pressing the arm above the wrist. 15. How many bones are there in the hand ? Twenty-seven. 16. How are they divided ? There are eight in the wrist, five in the palm of the hand, and fourteen in the fingers. 17. What are the bones in the wrist called ? The carpal bones. 18. What name is given to those in the palm of the hand ? The metacarpal bones. 19. What are the finger bones called? The phalanges 22 dinsmore’s first lessons 2o. How many bones are there in the fingers ? There are three bones in each finger, but the thumbs have only two instead of three. VI.—THE BONES OF THE LEGS. 1. How many bones are there in each leg? Thirty. 2. How many large parts are there in the leg ? Three, the thigh, lower leg and foot. 3. Where is the thigh ? The part between the trunk and knee. 4. What is the lower leg ? The part from the knee to the ankle. 5. What is the foot ? The part below the ankle. 6. How many bones are there in the thigh ? One, the femur or thigh bone. 7. How many bones are there in the lower leg ? Three, one in the front of the knee, called the patella or knee-pan, and two below it. 8. What are the names of the two below the knee-pan ? The tibia or shin bone, and the fibula or small bone. The thigh-bone (femur) sawed lengthwise. IN PHYSIOLOGY AND HYGIENE. 23 9. How many bones are there in the ankle Seven. 10. How many between the ankle and toes Five. 11. How many in the toes? Fourteen. 12. What are the bones in the ankle called ? The tarsal bones. 13. What name is given to the five bones between the ankle and toes ? The metatarsal bones. 14. What are the bones in the toes called ? The phalanges. Questions. 1. What are the principal bones of the trunk ? 2. What are the parts of the backbone called ? 3. Can you describe the ribs ? 4. Are the floating ribs above or below the other ribs ? 5. How many bones are there in the arm ? 6. Can you name the parts of the arm ? 7. Is the radius above or below the elbow ? 8. How can you find the ulna? 9. How many bones are there in the hand ? 10. What are the phalanges ? ix. Do you know whether there are more bones in the arms or legs ? How many? 12. Which part of the leg is called the thigh ? 13. What is the knee-pan? 24 dinsmore’s first lessons 14. Are there the same number of bones in each toe ? No, the big toes have only two bones, while the others have three. VII.—DIFFERENT KINDS OF BONES. x. How are the bones arranged as to their shape ? In four groups. 2. What are the names of the four groups ? Long, small, flat and irregular bones. 3. Which are the long bones ? The ribs and the longest of the bones in the arms and legs. 4. Are the bones of the arms and legs solid or hollow ? They are hollow, but have inside of them an oily wax-like substance called marrow. 5. Why should not the bones be solid instead of hollow ? It is thought that if the bones were solid they would be entirely too heavy for the body. 6. Where are the small bones ? The principal ones are the bones which form the spinal column, the knee-pans, and the small bones in the wrists and ankles. 7. Are the bones of the spinal column solid or hollow ?* They are hollow, and contain a line of marrow called the spinal cord, which extends through the bones of the neck to the brain. * Each part of the backbone is almost solid, the part through which the spinal column passes is simply an opening through the bone. IN PHYSIOLOGY AND HYGIENE. 25 8. Give some examples of the flat bones ? Several of them unite to form the upper part of the skull, while the shoulder-blades and the breast-bone belong to the same class. 9. What are the irregular bones ? Those which are of different shapes. 10. Where are they found ? Almost all are in the head. VIII.—THE FLESH—THE SKIN. 1. Of what are the partly solid portions of the body composed ? Of flesh and other soft substances. 2. What are the divisions of the flesh and other sub- stances ? The skin upon the surface of the body, the muscles, tendons and internal organs. 3. What is the color of the skin ? It varies from white to yellow, brown, red and black. 4. Why is this ? We do not know, but it is thought that, probably, the climate in the different parts of the world affects the color of the skin. 5. Do men have the same kind of bones, flesh and blood, all over the world ? Yes, the inner parts of man are almost the same throughout the world. 6. What is the skin like ? 26 dinsmore’s first lessons It is formed of two layers, and is full of small blood vessels and tiny openings. 7. How do we know that the skin is formed of two layers ? We know it from the fact that when it is burned slightly the outer layer rises, and a liquid gathers between it and the inner one, forming a blister. 8. What name is given to the outer layer? The cuticle or scarf skin. 9. What is the name of the inner layer ? The cutis or true skin. 10. How is it known that the skin contains small blood vessels ? When it is cut deep enough to reach the true skin it bleeds. 11. How is it known that the skin is full of tiny pores ? When a man works until he becomes heated, a liquid escapes through the pores, and the surface of the body becomes moist. 12. What is the name of the liquid which passes out in this way? It is called sweat or perspiration. 13. When a man sweats what is the effect upon him ? He becomes cooler. 14. If a poison were to be rubbed on a man’s arm what would be the effect ? It would enter the body through the tiny pores and injure the man. IN physiology and hygiene. 27 Questions. 1. How many groups of bones are there ? 2. Give the name of each. 3. Can you find three long bones in your arm ? 4. What do the bones have inside of them ? 5. What is the brain ? 6. What is the spinal column ? 7. What shape is the knee-pan ? 8. How do we know that the skin has openings in it ? 9. How do we know that there are two layers ? 10. Which is the true skin, the outer or the inner layer? 11. When a boy sweats does it make him hotter or cooler ? IX.—THE HAIR AND NAILS. 1. What is found upon the surface of the body? A growth of fine hair. 2. Are all parts of the body equally covered with hair? No, the head has more upon it than any other part. 3. What is the color of the hair? It is of different colors, from a very light to a coal black. 4. What is it that gives color to the hair ? A kind of coloring matter, a portion of which is around the root of each hair. 5. Why is it that the hair becomes gray as people advance in life ? After middle life, and sometimes earlier, the col- oring matter gradually dies and the hair becomes colorless, or white. 28 dinsmore’s first lessons 6. Do any classes of the human race have hair of the same color? Yes, the Indians have long, straight, black hair, while that of the Africans, which is also black, is short and curly. 7. What is the nature of the hair? Each hair seems to be solid, but it is hollow, like a tube, and has a tiny opening in the centre of it, all the way from one end to the other. 8. How does the hair grow ? It grows from the cuticle. At the root of each hair there is a tiny sac or vessel, from which the hair draws nourishment, like a plant growing from the ground. 9. Does the body furnish any oil to the hair? Yes, enough to keep it soft and in good condition. 10. Is it wise to allow hair- dressers to put oil on the head ? It is not.' A great deal of the oil which they use is not only useless, but injures the scalp, so that the hair either falls out or the person becomes troubled with dandruff. 11. Why do persons sometimes lose their hair after being sick ? A, a perspiratory tube with its gland; B, a hair with a muscle and two oil-glands; C, cuticle: D, papilla ; and E,.fat-cells. IN PHYSIOLOGY AND HYGIENE. 29 This usually occurs in the case of those who suffer severely from brain fever. The head becomes so heated that the moisture in the small sac at the root of each hair is burned out, and the hair dies and falls off, some- what like the plants droop and perish during the hot, dry season. 12. What do we find upon the ends of the fingers and toes ? Nails, which look like bones. 13. Do the nails remain the same all the time, like the teeth and bones ? No, they are constantly growing and should be trimmed at least once a week. 14. When may pupils be said to be in mourning? When their finger nails are black. 15. What do black finger nails show ? They show that the owners of them are careless, untidy persons. X.—THE MUSCLES AND TENDONS. 1. What are muscles ? The parts of the body which form the lean meat. 2. When the muscle is divided what are the parts like? It may be easily separated into strings, or fibres, and each fibre is formed of still smaller threads, called tissues. 3. What are the tendons like? They are formed of hard, gristly matter, and con- nect the ends of the muscles with the bones. 30 dinsmore’s first lessons 4. What useful purposes do the muscles and tendons serve ? They give form to the figure, and by their use we are able to move the different parts of our bodies. 5. Are the muscles stiff and hard to work ? No, they are elastic, like rubber, and move easily. 6. How many muscles are there ? More than five hundred. 7. Are they all bound together? They are not, there are special muscles for the head, breast-bone, stomach, arms, feet, and many other parts of the body. 8. Where are some of the muscles which may easily be felt ? On the arm between the shoulders and elbow, and on the legs between the knee and ankle. 9. Where may the tendons be found ? They may be felt within the elbows, at the wrists, under the knees, and back of the ankles. 10. What are the internal organs which are composed of partly solid material ? The brain, in the head ; the heart and lungs, in the chest; and the stomach and other parts in the abdomen (ab-do-men). 11. Are they at all like the muscles and tendons which form the outer part of the body? They are softer and of different shapes, but in even- case are made of flesh, which is composed of muscle and tissues. 12. What are the liquids in the body? The Muscular System. IN PHYSIOLOGY AND HYGIENE. 31 Water, blood and juices. 13. How much water is there in the system ? Almost three-fourths of the body is water. 14. Of what is the blood made ? Of water, coloring matter and fibrin. 15. What is fibrin ? It is the fibre part which is left when the blood dries. 16. What are the juices like? Some contain sugar, and are sweet, others contain salts, and are sour. XI.—THE JOINTS. 1. What are the names of the places where the bones meet ? They are called joints. 2. How many principal kinds are there ? Two, fixed and movable. 3. What are the fixed joints ? Those in which the bones are not free to move. 4. What examples may be given ? The flat bones of the skull are united so as to make one solid body. 5. What other example may be given ? There are five bones in the lower part of the spine, which, in childhood, are separated, but afterwards grow together, so as to form one bone. 6. What are movable joints ? Those in which the bones are free to move. 32 dinsmore’s first lessons 7. How many kinds are there ? There are two principal kinds, the hinge, and ball and socket joints. 8. What example may be given of the hinge joints ? At the elbows and knees the arms and legs move back and forth like hinges. 9. What is a ball and socket joint like ? One bone, which is round on the end, fits into another, which is hollow, like a tea-cup. 10. What example may be given of such joints? The upper bones in the arms and legs are round on the ends and fit into sockets in the shoulder and thigh bones. 11. Does a ball and socket joint give the arm more or less chance to swing, than it has at the hinge joints ? It gives it a much better chance, for the arms may be whirled around in a circle. 12. How are the bones held in place at the joints, and why do they not scrape against one another when the body moves ? They are held in place by strong gristle or cartilage, which grows all over the ends, and they are supplied with a thick fluid, like the white of an egg, which keeps them smooth and oily. General Review. 1. Of what does Physiology treat ? 2. How can we tell the difference between a plant and an animal ? IN PHYSIOLOGY AND HYGIENE. 33 3. Is man a plant or an animal ? 4. Is the stomach above or below the heart ? 5. What is the name of the mineral which forms the greater part of the bone ? 6. How many bones are there in the human body? 7. Are the bones of an aged person hard or soft? 8. Which will grow together first, the bones of a child or those of an older person ? Why ? 9. Are the teeth counted as bones ? 10. What are the principal bones of the trunk? 11. What are the floating ribs? 12. How many bones are there on each side of the body ? 13. Where is the shin-bone? 14. How many groups of bones are there ? 15. What is marrow? 16. What are the parts of the backbone called? 17. Is the breast-bone flat or round ? 18. What is the color of the skin ? 19. If the skin were covered with poison would it injure the person ? How? 20. What is fibre ? 21. What is the difference between a muscle and a tendon ? 22. Do the muscles form the fat or lean meat ? 23. Of what are the internal parts of the body com- posed, hard or soft substances ? 24. What are the liquids in the body ? 25. Are the juices in the body sweet or sour ? 26. What are the joints ? 34 dinsmore’s first lessons 27. What is a hinge joint ? 0 28. Can you find four hinge joints in your body? 29. What is the ball and socket joint like? 30. How are the bones held together at the joints ? PART SECOND. HYGIENE. PART SECOND. XII.—HYGIENE. 1. Of what does Hygiene treat ? Of the laws which govern the health and growth of the human body. 2. What good rules may be laid down in order that the body may be kept strong and vigorous ? (a) It should be supplied with good food. (b) It should be kept clean and properly clothed. (r) There should be regular exercise. (d) A person should take a season for rest after engaging in hard work. (