192 A COURSE ON ZOOLOGY. 



the lowest African tribes it is as low as sixty-four, that 

 is, a little lower than the Sai monkeys, whose facial angle 

 is sixty-five. and almost as low as the orang-outang, 

 which during the earlier period of its life has an angle 

 of sixty-three, although this afterwards falls during 

 complete development to thirty-five. The angle of the 

 magot monkeys is not more than forty-five or fifty. In 

 the horse and the pig it is eleven ; twenty-five or twenty- 

 six in the sheep and goat ; twenty-six to thirty in the 

 dog ; thirty to thirty-six in the cat. 



The study of the human family has enabled its classi- 

 fication into three distinct races : the Caucasian or white, 

 the Mongolian or yellow, the Ethiopian or black. 



"The Caucasian race has received its name because 

 traditions place its birthplace in the mountains of Cau- 

 casus, whence it has spread by radiating migrations to 

 all parts of the surface of the globe. One of these 

 branches settling in Western Europe gave rise to the 

 Europeans ; others travelling in different directions 

 spread over all the regions of Western Asia and Northern 

 Africa; from these came the Chaldeans, the Hebrews, 

 Phoenicians, Arabs, Persians, Scythians, Hindoos, and, 

 probably, the Egyptians. The Caucasian race is dis- 

 tinguished by the beauty of the oval which outlines the 

 head, by the prominent forehead, and by the large facial 

 angle, which is about eighty degrees, as well as by the 

 white or only slightly-tinged skin. 



" The Mongolian race appears to have originated in 

 the Altai Mountains, from which it extended into Cen- 

 tral and Eastern Asia and the neighboring islands. 

 The Tartars, the Chinese, and the Japanese are the 

 principal branches ; perhaps, also, the Laps, the Green- 

 landers, and the Esquimaux are descendants of the 



