OF THE CLASS MAMMALIA. 



251 



ago extinct, or nearly so ;* but nature seems to oppose the 

 transfer of a race from the continent on which it first ap- 

 peared to another. Thus the English make no progress in 

 reality in India, and from northern Africa all the immigrant 



Fig. 190 h. Caffre Skull. 



races of Phoenician, Greek, Roman, Vandal, &c., have disap- 

 peared. The Spanish blood will ere long become extinct in 

 America, 



Fig. 190 t. The Cherokee Head. 



" The anatomical structure of the races of man differs con- 

 siderably, so that there is not the slightest difficulty in dis- 



* See Races of Men: a Fragment. By Dr. Knox. London: Renshaw. 



