844 FALLACIOUS CONCLUSIONS. 



earth becomes much warmer, than the waters of 

 lakes and seas, which are in a state of perpetual 

 motion and circulation. 



In accordance with the erroneous views of 

 Hunter, Mason Good observes, that "in all de- 

 grees of atmospheric temperature which the body 

 can endure, it preserves an equality of its own 

 temperature." (Book of Nature, vol. i. p. 241.) 

 With Sir Gilbert Blane, Dr. Paris maintains, that 

 animal heat depends chiefly on the living prin- 

 ciple, which has the power of regulating tempe- 

 rature. And Dr. Roget observes, that " man, 

 wherever born, can go through the wide range of 

 external temperature which lies between the 

 freezing and boiling points, without undergoing 

 the slightest alteration in that of his own body." 

 (Lib. of U. Knowledge, An. Physiology, p. 10,9.) 



The supposition that animals have the power 

 of generating cold, was long upheld by some im- 

 perfect and fallacious experiments of Fordyce, 

 Blagden, Dobson, and others, who reported that 

 they had remained in air heated to from 130 to 

 260, for ten and fifteen minutes, without the 

 temperature of their bodies being raised more 

 than 2 above the normal standard. (Phil. Trans, 

 for 1784-5.) 



But it had been previously ascertained by Dr. 

 Crawford, that on confining a dog in air heated 

 to 134 for fifteen minutes, his temperature under 

 the fore arm rose from 102 to 106 ; and that 

 when placed in water at 114, it rose from 102 to 



