Chap. 3-2.] Water expired from the Lungs. 337 



correfponding in weight with the matter difcharged by 

 the lungs. Dr. Prieftley, by a feries of experiments 

 recorded in vol. Ixxx. p. 106. of the Philofophical 

 Tranfactions, has accordingly proved, that a confider- 

 able quantity of vital air is abforbed by the blood. A 

 very fmall portion of water is alfo thrown from the 

 lungs at every expiration, which may be either an 

 aqueous exhalation from the Iungs 3 or may be formed 

 by an union of vital air with inflammable gas. 



Mr. Lavoifier afcertained that when the air out of 

 doors confided of, 



27 parts oxygen air, 

 73 azotic air. 



ICO 



The air in the lowed ward in the General Hofpital 

 at Paris, contained but 



25 parts of oxygen air, 

 71 of azotic air, 

 4 of fixed air; 



100 



This proportion varied In different parts of the 

 room. At the top the air contained the following 

 proportions : 



i8 parts of oxygen air, 

 79 of azotic air, 

 2f of fixed air. 



100 



The production of animal heat next properly claims 

 our attention. That refpiration is really the caufe of 

 animal heat can fcarcely be doubted j for thofe ani- 

 ,mals which are furriiftied with lungs, rind which con- 

 tinually infpire the frefh air in great quantities, have 

 the power of keeping themfelves at a temperature con- 

 Tot. III. Z fiderably 



