410 On the Influence of the Brain 



row about the same time when the experiment was begun 

 on the first rabbit. Being in the s^anic temperature, the 

 time was noted when the ihermoaieter in the rtctum had 

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

 that it might be as nearly as possible under the same cir- 

 cumstances 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 -^'^ of car- 

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

 inches. 



502 H- 52 + 2 — 50 50G „ , 



■ ^ =-^ = 20-24. 



20*24 cubic inches of carbonic acid were therefore extri- 

 cated in 30 minutes, which is at the rale of 40*48 cubic 

 inches in an hour. 



The carbonic acid given out in the same space of tim.e 

 was less than in the former experiments ; but it is to be 

 observed, first, that in consequence of the ligatures the ex- 

 tent 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 difl'erence in the results, in the subsequent 

 experiments 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 circulati(m was un- 

 diminished, and all chance of accidental haemorrhage was 

 avoided. 



Experimejtt 5. — ^Thermomele? 65°, barometer 29*8 inch. 



Two rabbits were procured, each occupying the space of 

 45 cubic inches. They were both inoculated with the 

 woorara poison. 



The first rabbit was apparently dead in nine minutes after 

 the application of the poison ; but the heart continued to 

 act. The lunes were iufiaied for about two minutes, by 

 .means of a pair <if bellows, when the thermometer in the 

 rectum was observed to stand at 98'. The animal was 

 placed under the bell-glass, and artificial respiration was 

 produced by means of pressure on the gum- bottle, as in the 

 last experiment. At the end of 30 minutes, a portion of 



• In measuring the heat of the rectum in these cvpcriments, care is ne- 

 cessary that the thermometer should always l>e introduced to exacily the 

 came 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 

 keat longer than the bupeificial, 



air 



