THE MAMMALS 253 



As usually understood, the family of man (Hominidce) 

 contains but a single species, cosmopolitan and highly vari- 

 able. This species is "now split up into many subspe- 

 cies or races, the native man of this continent, or ' Ameri- 

 can Indian,' being var. americanus. Other races now 

 naturalized in America are : the Caucasian race, var. euro- 

 pc&us ; the Mongolian race, var. asiaticus ; and the negro 

 race, afer. The first of these is an immigrant from Europe, 

 the second from Asia, and the third was brought hither 

 from Africa by representatives of var. europmus to be used 

 as slaves." 



