TTEIBr33X^TTO3Sr 
READER! 
If you know all about this, give it to your Neighbor. 
An Extract from a work hy Priestley, on Respiration and the use of the Blood 
Page 64. Vol. 3. 
says that “Mr. Cigna of Turin takes it for granted, that Air which 
has once been.breathed is unfit for further respiration, on no other account 
than its being loaded with noxious vapors, which discover themselves by a fetid smell. 
And he takes it for granted that the elasticity of the Air is diminished by respira- 
tion, though he does not consider that diminuation of elasticity is the cause of its 
noxious quality. He therefore concludes that Air which has been breathed suffocates 
by means of the irritation which it occasions to the lungs, by which the bronchia and 
the lungs themselves are contracted, so as to resist the entrance of the Air; and 
therefore, that respired Air is noxious on the same account as mephitic vapors, or 
those of burning brimstone, that, in frequently breathing the same Air, it becomes 
loaded with these vapors, as to excite a convulsion in the lungs, and thereby render 
them unfit for transmitting the blood.” 
But Priestley made the discovery that common Air contained a gas, now termed 
‘‘Oxygen,” which, when respired, combines with the blood, imparting vitality and 
causing it to circulate freely through the system. Oxygen forms only one-fifth of 
the atmosphere, and is consumed by combustion and respiration. These facts consid- 
ered should make mankind guard their health by proper VENTILATION. 
MIHAPCS SYSTEM 
Has proved all that is claimed for it. It has been thoroughly tested, in both public 
and private buildings. During the last four years thousands have been made healthy 
and happy by its use. It is now on free exhibition at the office of the 
where references and further information can be obtained. 
STATE RIGHTS FOR SALE. 
Send 1 cent stamp for Catalogue of Ventilating Appliance. 
P. Ml HAN, Ventilating Engineer, 
Kntkhwusk Job Print, 364 Atlantic Avenue. 
No. I Pemberton Square (Room 9,) Boston.