PECULIAR SECRETIONS. 379 
Dr Forpyce’s experiments, the heat of the human body, 
in a high temperature, speedily reached 100°, but expo- 
sure to 211° did not raise it higher *. The temperature 
of the dog could be raised no higher than 109°, though 
exposed to 112°. The viper, though exposed to a tem- 
perature of 108°, only had its heat raised to 923°. Here, 
then, it is obvious, that the body of a living animal 1s capa- 
ble of resisting the influence of a high temperature, and 
remaining comparatively cool, though exposed to a heating 
cause. That the body is not kept cool by evaporation, is 
demonstrated by a variety of circumstances. In Dr For- 
DYCE’s experiments, with his body in heated air, water 
poured down in streams over his whole surface. But that 
this water was merely the vapour of the room, condensed 
by the coldness of his skin, appeared clear, from his having 
placed a Florence flask filled with water of the same tem- 
perature with his body, viz. 100°, when he observed the 
vapour in like manner condense upon its surface, and run 
down the sides in streams. Besides, the cold is generated 

instrument close to the hotest part of my body, and have been astonished to 
observe, that it has subsided several degrees. Indeed, I never could raise 
the mercury above 97° with the heat of my body.” Phil. Trans. 1758, 
p- 755. 
* Dr Biacpen, who assisted in performing these experiments, observes, 
«¢ Being now in a situation in which our bodies bore a very different rela- 
tion to the surrounding atmosphere, from that to which we had been accus- 
tomed, every moment presented a new phenomenon. Whenever we breath- 
ed on a thermometer, the quicksilver sunk several degrees. Every expira- 
tion, particularly if made with any degree of violence, gave a very pleasant 
impression of coolness to our nostrils, scorched just before by the hot air 
rushing against them when we inspired. In the same manner, our now 
cold breath agreeably cooled our fingers whenever it reached them. Upon 
touching my side, it felt cold like a corpse.” Phil. Trans. 1775, p. 118. 
