An Account of some Experiments on Animal Heat. 453 



1. Venous blood 102-5 Arterial blood 104 



2. 1^4 103 



a. . 104 ■ 105 



4. ■ 103-5 105 



5. , 104 • 105 



Tlie following results were obtained from three experiments 

 on slieep, whose exact age I could not ascertaiTi. Tlu; tliermo- 

 meter in the shade was (iO. 



1. Venous blood 103-5 Arterial blood 104-5 



2. ■ 102-5 ■ 104 



3. ■ 103 • 104 



The experiments on oxen were only two in number. The 

 temperature of the air was 64. 



I. Venous blood 100 Arterial blood 101-5 

 2. 100 • 101 



In both iiistances the oxen were knocked down before the 

 vessels were opened ; and as respiration had ceased in consc- 

 ([uence of tlie injury of the brain and spinal cord, no difference 

 of colour, of course, was perceptible between the blood from the 

 jugular vein and that from tlie carotid artery. 



The^c results, so dififerent from what miglit have been ex- 

 pected, from the observations of Messrs. Coleman and Cooper 

 on the temperatui'e of the two sides of the heart, led me to re- 

 peat their experiments. The experiments in which I place most 

 confidence were made on lambs about four months old, and to 

 these I sliall conhne m}'self at present. In each instance tbe 

 animal was killed bv the di\ision of the groat vessels of the neck ; 

 an opening was made immediately into the thorax, and a very 

 delicate thermometer was introduced into the ventricles of the 

 heart bv means of a small incision. The operation occupied so 

 short a space of time, that in three instances the right auricle 

 had not ceased contracting. 

 1. 



I cannot well explain tlie difference which exists bstween the 

 results of the preceding experiments, and those of Messrs. Cole- 

 man and Cooper, whi.jh are directly opposite. Can tlie mode' 

 in which the animals they experimented on were put to death, 

 be the cause of the want sf agreement? In death by asphyxia, 

 there is generallv an accirnudiition of t)luod in the right ventricle; 

 and in many instances I have observed, wlien the right ventricle 



F f 1 has 



