Reflections on Heat. 187 



the vessels with hot water, I left them, at the same time, 

 to cool in the air of a large quiet room. 



The vessel covered with a black skin represented a 

 negro ; the one covered with a white skin represented 

 a white man. 



The negro cooled considerably more rapidly than the 

 white man, requiring 23^ minutes to cool through the 

 usual interval of 10 degrees, while the white man re- 

 quired 28 minutes to cool through the same interval. 



This interesting experiment was made at Munich, the 

 26th of March, 1803. The results of these experi- 

 ments need no illustration ; and I leave to physiolo- 

 gists and physicians to determine what advantages may 

 be derived from them in taking measures for the pres- 

 ervation of the health of white men who are called 

 upon to dwell in hot countries. 



[This paper is translated from the Moniteur Universe!, 9 Messidor, 

 An 12 (June 26, 1804).] 



