210 MB HAYCRAFT on the Specific Heat of the Gases. 



minutes, the calorimeter A had assumed the temperature of 

 74/ , and calorimeter B that of 75.10; the surrounding me- 

 dium being 54 ; indicating the capacity of olefiant Gas to be 

 10643. 



No. 5. 



The last experiment was repeated, and gave a result of 

 10674 ; the medium result of experiments Nos 4. and 5. being 

 10658, indicating the capacity of olefiant Gas procured from al- 

 cohol and from sea-coal to be almost exactly the same. 



XT ^ 



No. 6. 



Wishing to ascertain if the ethereal or empyreumatic vapour 

 in olefiant Gas affected its specific heat, I poured a few drops of 

 sulphuric ether into the part of the apparatus containing atmo- 

 spheric air, that the latter, as well as the olefiant Gas, being 

 equally saturated with the vapours of ether, it might be ascer- 

 tained what effect that condition might have on the capacities of 

 the Gases. The part B contained the olefiant Gas as before. 

 After 40 minutes, both the calorimeters had acquired a tempera- 

 ture of 85^V, the surrounding medium being 61^. The in- 

 ference, then, may fairly be made, that it is the combined vapour 

 that increases the specific heat of olefiant Gas. 



Experiments on the Air of Respiration. 



Having last year made more than ten experiments which 

 prove that the mixtures of carbonic acid with atmospheric air 

 exposed freely to water, and at a temperature of about 100, had 

 a much less capacity for heat than atmospheric air had, under 

 ordinary circumstances, and this curious fact seeming to throw- 

 some light upon the physiology of animal respiration, I filled the 



