AND ANIMAL LIFE. 175 



although correct, do not in the least warrant the 

 conclusions that he has deduced from them, as 

 he has omitted to take into consideration the 

 various conditions of the system at the different 

 seasons and periods of life, which have been shown 

 to modify the results of his experiments. It has 

 been supposed by some, that the evaporation 

 which takes place at high temperatures is the 

 principal reason that the effects of heat are coun- 

 teracted ; by others, that the blood is cooled in 

 its circulation from being distributed to parts 

 possessing different degrees of heat. 



CXCIII. It is impossible to deny the great in- 

 fluence which the two latter causes exert in re- 

 ducing the temperature of the body when sub- 

 jected to a heat a few degrees higher than what 

 is natural ; but I cannot consider them sufficient- 

 ly powerful to account for the possibility of bear- 

 ing the degree of heat to which FORDYCE, DE- 

 LAROCHE, and BERGER have been exposed. Be- 

 lieving these causes to be insufficient, and at the 

 same time being persuaded that the views of 

 CRAWFORD are altogether objectionable, I shall 

 attempt to give other reasons to explain the re- 

 sources of the animal economy. 



CXCIV. When an individual is engaged in 

 violent exercise, the blood becomes more equally 

 distributed throughout the system, and the ten- 

 dency of this change is to relieve the lungs and 

 internal viscera of a quantity of sanguineous 



