Mil HAYCRAFT on the Specific Heat of the Gases. 211 



part B with air from the lungs, and the part A with atmosphe- 

 rical air. 



The heating apparatus was kept, by means of a lamp, at the 

 temperature of between 97 g and 100 . After the end of 35 

 minutes, the calorimeter, through which the air of respiration 

 passed, attained the temperature of 59 /-Q, and the other that of 

 61 g-* ; the surrounding medium being 5 4. 16, indicating the air 

 of respiration to be 6875. 



eau oo 



JNo. . 



The last experiment was repeated, when the calorimeter arose 

 from 56Vo to 58 J, and B from 56<VV to 57 if, indicating the 

 capacity of the air of respiration to be, as in the last experiment, 

 6875. 



It may not be improper in this place to state, that, in my for- 

 mer experiments, mixtures of carbonic acid and atmospheric air, 

 under different conditions of temperature, and combination with 

 watery vapour, had relative capacities of 3333,66666.9999, and 

 13333. It was my intention to have repeated those experiments 

 in such a way as to ascertain the precise conditions under which 

 these changes of capacities took place ; but, from various engage- 

 ments, I am unable to do so. I may remark, however, that the 

 last two experiments seem to indicate, that the air of respiration 

 enters into the second of this series, making allowance for the 

 difference of the standard of comparison ; this being, in my for- 

 iner experiments, common undried atmospherical air, while the 

 standard of the latter was the same air carefully dried. 



There is also a curious coincidence between this last-men- 

 tioned series of capacities of gas in different states of combina- 

 tion with water, and the expansive forces of air combined also 

 with different proportions of watery vapours. Having procured 

 a glass globe, to which a small stem was connected, in such a way 



D d 2 



