Amhfis of the Air. 233 



air in the glafs vefiel *De Sp. Nitro-aerto, 

 p. 104. 



1 placed on the pedeftal, under the inver- 

 ted glafs z> z a a, (Fig. 35.) a ^ grown 

 Rat. At firft the water fubfided a little, 

 which was occasioned by the rarifaftion of 

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

 body. But after a few minutes the water 

 began to rife, and continued rifing as long 

 as the Rat lived, which was about 14 houfs. 

 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 73 cubick inches, above / 7 part 

 of the whole, nearly what was abforbed 

 by a Candle in the fame veffd, in Experi- 

 ment 106. 



I placed at the fame time in the fame 

 manner another almoft half grown Rat 

 under a veflel , whofe capacity above the 

 furface of the water zz (Fig. 5 5.) was but 

 594 cubick inches, in which it lived 10 

 hours j the quantity of elaftick Air which 

 was abforbed, was equal to 45 cubick 

 inches , viz. h part of the whole air i 

 which the Rat breathed in : A Cat of 3 

 months old lived an hour in the fame re- 

 ceiver^ 



