'204 ANIMAL HEAT. 



The carbonic acid evolved was, therefore, equal to 28'22 cubic 

 inches in half an hour, which is at the rate of 56 44 cubic 

 inches in an hour. 

 Exp. 3. ExP- 3 - Thermometer 64", barometer 30*2 inches. 



Another con- A young rabbit, occupying the space of 48 cubic inches, was 

 •ame quantity a ^ owe ^ t0 remain under the bell-glass during the same pe- 

 4(f riod as in the two former instances. The respired air contained 



T ig- of carbonic acid. 



502 + 52 + 2 ~ 48 508 



3= = 28*22. 



18 18 



The results of this were, therefore, precisely the same as those 

 of the last experiment. 



These experiments were made with great care. The ani- 

 mals did not appear to suffer any inconvenience from their 

 confinement, and their temperature was unaltered. 



The next order of experiments were made for the purpose 

 of ascertaining the quantity of air consumed by animals, in 

 which the circulation of the blood was kept up by means of 

 artificial respiration, after the brain had ceased to perform its 

 functions. 

 Exp. 4, . . Exp 4. Thermometer 65°, barometer not noted, 



were killed by Having procured two rabbits of the same size and colour, 

 dividing the I divided the spinal marrow in the upper part of the neck of 

 The^eat^r* nne '°f them. An opening was made in the trachea, and the 

 off but the lungs were inflated ai first by means of a small pair of bellows. 

 ciaTres* Nation ^ wo 1'gatures were passed round the neck, one in the upper, 

 on the air was and the other in the lower part behind the trachea. The liga- 

 not materially tures were drawn tight, including every thing but the trachea j 

 and the nerves, vessels, and other soft parts between them 

 were divided with a bistoury. Eight minutes after the division 

 of the spinal marrow, the thermometer in the rectum had 

 sunk to 97°. The animal was placed under a bell-glass/ and 

 the lungs were inflated by pressing on the gum-bottle about 

 fifty time* in a minute. When this process had been continued 

 " for thirty minutes, • portion of air was preserved for examina- 

 tion. The heart was found acting regularly, but slowly, the 

 thermometer in the rectum had fallen to gQ Q . 



The second rabbit was killed by dividing. the spinal marrow 

 about the same time when the experiment was begun on the 



first 



