%$6 Analyfa of the dir. 



tvithftanding the fame quantity of abforbing 

 fubftances would, in a larger quantity of air, 

 have abforbed much more air; and this is 

 the reafon why I was never able to deftroy 

 the whole elafticity of any included bulk of 

 air, whether it was common air, or new 

 generated air. 



Experiment CVII. 



May 1 8. which was a very hot day, I 

 repeated Dr. Mayow\ Experiment, to find 

 how much air is abforbed by the breath of 

 Animals inclofed in glafles, which he found 

 with a moufe to be -^ part of the whole 

 air in the glafs veffel, De Sp. Nitro aere$> 

 f. 104. 



I placed on the pedeftal, under the invert- 

 ed glafs zza a, (Fig. 35. ) a full-grown 

 Rat. At firft the water fubfided a little, 

 which was occafioned by the rarefa&ion of 

 the air, caufed by the heat of the animal's 

 body. But after a few minutes the water be- 

 gan to rife, and continued riling as long 

 as the Rat lived, which was about 14 hours. 

 The bulk of the air in which the Rat 

 lived fo many hours, was 2024 cubick inches; 

 the quantity of elaftick air which was ab- 

 forbed, was ji cubick inches, above vf part 



of 



