26 ON THE INFLUENCE 



experiment was begun on the first rabbit. Being 

 in the same temperature, the time was noted 

 when the thermometer in the rectum had fallen 

 to 97, and it was placed under another bell-glass, 

 that it might be as nearly as possible under the 

 same circumstances as the first rabbit. At the 

 end of 30 minues, the thermometer in the rectum 

 had fallen from 97 to 91.* 



The air respired by the first rabbit contained 

 ^V of carbonic acid. The bulk of the rabbit was 

 foundzr50 cubic inches. 



502+52+2-50 506 . 

 -25- = 25-= 20 ' 24 - 



20*24 cubic inches of carbonic acid were there- 

 fore extricated in 30 minutes, which is at the rate 

 of 40*48 cubic inches in an hour. 



The carbonic acid given out in the same space 

 of time, was less than in the former experiments; 

 but it is to be observed, first, that in consequence 

 of the ligatures, the extent of the circulation was 

 diminished ; secondly, that in this instance one 

 of the ligatures accidentally slipped, and an 

 ounce of blood was lost in the beginning of the 

 experiment. 



As it was desirable to avoid any circumstances 

 which might occasion a difference in the results, 



* In measuring the heat of the rectum in these experi- 

 ments, care is necessary that the thermometer should always 

 be introduced to exactly the same distance from the external 

 parts, otherwise no positive conclusion can be drawn relative 

 to the loss of heat, as the more internal parts retain their 

 heat longer than the superficial. 



