ANIMAL HEAT. 205 



first rabbit. Being in the same temperature, the time was 

 noted when the thermometer in the rectum had fallen to q7°, 

 and it was placed under another bell-glass, that it might be as 

 nearly as possible under the same circumstances with the first 

 rabbit. At the end of 30 minutes, the thermometer in the 

 rectum had fallen from 97 to 91*. 



The air respired by the first rabbit contained -J^ of carbonic Jfc 



acid. The bulk of the rabbit was found = 50 cubic inches. 



502 + 52 + 2 — 50 506 



,. = — = 20.24. 



25 25 



20*24 cubic inches of carbonic acid were, therefore, extricated 

 in 30 minutes, which is at the rate of 4048 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 the subsequent experi- 

 ments I employed animals, which had been inoculated with 

 the poison of woorara, or the essential oil of almonds j by 

 which means, while the functions of the brain were completely 

 destroyed, the extent of the circulation was undiminished, and 

 all chance of accidental haemorrhage was avoided. 



Exp. 5. Thermometer 65°, barometer 298 inches Exp. 5. 



Two rabbits were procured, each occupying the space of rabbits* were' 



45 cubic inches. They were both inoculated with the woo- killed with 



lara poison. . woorara The 



r consumption 



The first rabbit was apparently dead in nine minutes after of oxigen, by 



the application of the poison : but the heart continued to act. art ! fic,a . 1 res P 1 * 



rr * ration, in one 



The lungs were inflated for about two minutes, by means of a of them, was 



pair of bellows, when the thermometer in the rectum was n , ot much le8r 



than before; 



but in the 



* In measuring the heat of the rectum in these experiments, care is 



necessary that the thermometer should always be introduced to exactly 

 the same distance from the external parts, otherwise no positive conclu- 

 sion can be drawn relative to the loss of heat, as the more internal 

 parts retain their heat longer than the superficial, 



observed 



