es > 
34. On Respiration tnd Animal Heat. 
of carbonic acid formed in 24 hours is about 
3 lbs. which are equal to 22 cubic feet. 
3. A quantity of aqueous vapour, the 
amount of which is still undetermined, is 
emitted from the lung's. 
In July, 1806, after. the preceding paper 
had been read, [I instituted a series of experi- 
ments on respiration, and on the combustion 
of charcoal, oil, &c. by the results of which 
I became convinced, that the changes made 
in common air, by the combustion of char- 
coal, and by respiration, are the same. I 
find the following note made on the 4th of 
July :—“ The result of all these experiments 
is, that breathed gas and gas in which chare 
coal has been burnt, are the same in regard to 
acid and oxygen, and that the acid is either 
equal to, or rather less than, the oxygen in its 
composition.” Since that time, I have made 
no more experiments relative to the subject. 
The substance of this note was soon after 
communicated to Dr. Thomson, who publish- 
ed it in the 3d Edition of his Chemistry, 1807, 
and corroborated it by the results of some 
subsequent experiments of his own. Though 
it had appeared from the experiments of 
Crawford, Menzies, and Davy, that the car-. 
honie acid produced. in. respiration was equal, 
or nearly. equal, to the oxygen consumed (in 
