724 INFLUENCE OF CLIMATE ON THE 



America, and New Holland, where the tempera- 

 ture rises twenty or more degrees higher, and 

 falls as many degrees lower at night. For tropi- 

 cal islands are perpetually fanned by the trade 

 winds, the temperature of which varies only a few 

 degrees. 



In regard to the influence of climate on the 

 size and configuration of the brain, we are yet 

 greatly wanting in accurate information. But 

 some valuable facts have been recently collected 

 and published by Dr. Morton, in a work entitled 

 Crania Americana, from which it would appear, 

 that among the least educated classes of the Eng- 

 lish, Scotch, Irish, Germans, Swiss, Dutch, and 

 Anglo-Americans, the head is larger than among 

 any other race. That this difference depends 

 more on climate, geographical position, and other 

 physical influences, than upon civilization, would 

 appear from the fact, that he found the mean capa- 

 city of the skull greater in three Esquimaux, than 

 in seven Chinese, in the ratio of eighty-six to 

 eighty-two cubic inches ; greater among the bar- 

 barous tribes of America, who reside in the temper- 

 ate and higher latitudes, than among the partially 

 civilized Peruvians, in the ratio of eighty-two to 

 seventy-six cubic inches, and seventy-nine in 

 the Mexicans. .The head is also larger among 

 the Tartars than the Chinese, Hindoos, and other 

 inhabitants of southern Asia. 



The relative capacity of the skull in what has 



