68 GIUFFRIDA-RUGGERI & CHAKLADAR 



least, cannot be affirmed with any decisive proof, nor do 

 I wish to bring in here other arguments which are known 

 by specialists of other branches of science ; but every one 

 sees that in various ways the possibility of the double 

 anthropological centre in the north 1 centre of origin of 

 the two great human types the white and the yellow 

 (beside which there are only equatorial types who are 

 more or less pigmented) is strongly placed before the 

 attention of physical anthropologists, without making any 

 excessive appeal to their faculty of imagination, by which 

 it is well that they should not be overmuch endowed. 



1 Granted the theory of Ologenesis, it would perhaps be a case of species by 

 couples that is to say of two twin specie^, born, as Rosa says, " by the duplication of 

 a common immediate progenitor." Even many of Rosa's theoretic previsions seem 

 to be confirmed by facts : Rosa writes -^ "These species by couples ought to be 

 recognised by characters which make them closely approach each other, leaving a 

 considerable interval between the two species of the couple and those near, perhaps 

 also they might with some facility produce hybrids among themselves, although not 

 stable, and then they ought to occupy almost a common area, inspite of eventual 

 differences oWiabitat, and the two species ought to be found associated with each 

 other even in regions that are not connected." ROSA (D.), Ologenesi. Nuova teoria 

 dell' evoluzione e della distribuzione geografica del viventi. Firenze, 1918. 



The so-called allogenes of Indo-China, the Pseudo-Mediterraneans of New Zealand 

 and others would find an explanation in a common progenitor. And the theory 

 would take a decisive step forward, if one could verify between the two species 

 some constant relations in the number of the cromosomes ; which should not be very 

 difficult. 



