130 THE LAWS OF ORGANIC 



from having a healthy appearance. I frequently 

 took the temperature of rabbits under a variety 

 of circumstances, and I generally found that the 

 young and the delicate evinced a low degree of 

 heat during the prevalence of cold, while the old 

 exhibited few changes, exposed to the same agent. 

 The difference in the results were attributed 

 to alterations of the circulation ; and believing 

 these to be the cause, I endeavoured, by the fol- 

 lowing experiments, to show that a medium tem- 

 perature, by allowing the blood to diffuse itself 

 more generally upon the surface of the body, 

 would certainly increase the faculty of generating 

 heat, as it relieves the internal organs on which 

 this depends. 



The temperature of twelve rabbits was taken that were 

 equally exposed to cold, 43 ; and the same three days after 

 were kept in a room at 67 for two hours. 



99 102 



99 103 



102 103 

 98 103 

 98 102 



102^ 103 



104 104 



103 



108 



103 105 



103 104 



100 103 



