376 



PHYSIOLOGY 



CHAP. 



were somewhat different, in a single continental centre of forma- 

 tion. The single character of the hypothesis will be preserved, 

 provided we do not enlarge the borders of this centre and that we 

 recognise that the strong likeness between all mankind proves 

 that it cannot be derived from very widely different forms, but 

 inclines us to believe at most that it originated in a single slightly 

 differentiated and therefore very plastic form, under conditions of 

 life very different from those now existing." 



FIG. 142. Warrior of Berbera, Somaliland (Notanthropus eurafricanus africus). (G. Sergi.) 



Giuffrida-Kuggieri, regarding, as he does, the human genus as 

 a collective species, composed of various elementary species, eight 

 in number, which he classifies in substantially the same way 

 as Sergi, merely applies certain general concepts of modern 

 biologists (De Vries, Cuenot, with which we dealt in the second 

 chapter of Vol. I.). 



We are forced to grant that at present the two doctrines are 

 striving for the mastery, but that so far no decisive argument has 



