on the Generation of Animal Heat. 409 



A fiomewhat smaller rabbit was allowed to remain under 

 the bell-glass during 30 mimites. The respired air con- 

 tained -~ ot carbonic acid. The animal occupied the space 

 ot" 48 cubic inches. 



• ;>02 +52 + 2-48 508 ^^ ^ 



= — - = 28-92. 



18 18 



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 m an hour. 



Experiment 3. — Thermometer 64°, barometer 30'2 inch. 



A young rab'oit, occupying the space of 48 cubic inches, 

 was allowed to remain under the bell-glass during the 

 same period as in the two former instances. The respired 

 air contained ~ of carbonic acid. 



50: + 52 + -2 — 4a 508 



= 28"22. 



IS 18 



The results of this were therefore precisely the same as 

 those of the last experiment. 



These '.'xpLiimtnts were made with great care. The 

 animals- did not appear to suffer any inconvenience from 

 their confinement, and their temperature was unaltered. 



The next order of experiments were made for the pur- 

 pose of ascertaining the quantity of air consumed by ani- 

 mals in which the circulation of the blood was kept up bv 

 means of artificial respiration, after the brain had ceased to 

 perform its functions. 



Experiment 4. — Thermometer 6j", barometer not noted. 



Haviuii procured two rabbits of the same size and colour, 

 I divided the spinal marro^v in the upper part of ihe neck of 

 one of them. An opening was made in the trachea, and 

 the lungs wesc inflated at first by means of a small pair of 

 bellows. Two ligatures were passed round the neck, one 

 in the upper and the other in the lower part, behind the 

 trachea. The ligatures were drawn tight, including every < 

 thing but the trachea ; 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 liad sunk, to 97^ The animal 

 was placed under a bell-glass, and the lungs were inflated 

 by pressing on the gum- bottle about 50 times in a minute. 

 When this process had been continued for 30 minutes, a 

 portion of air wa? preserved for examination. The heart 

 was found acting regularly, but slowly, the thermometer in 

 the rectum had fallen to 90-'. 



The second rabbit was killed by dividing the spinal mar- 

 row 



