No. 484] 



CLOSELY RELATED SPECIES 



239 



"virtually unknown." In the vegetable kingdom this is likely 

 to be an arduous task. The indications are that the adherents 

 of Mutation will be able to bring forward enougli cases of social 

 distribution to render phytogeogra})hic woaj)ons useless in the 

 attack upon this Theory. 



LITERATURE 



Castle, W. E., am) Foubks, Alexanokr. 



1906. Heredity of Hair-length in Cuinea-pigs and its hearing ...i die 

 theory of pure gametes. Published by the ( ai iu^iiif bistituiion 

 of Washmgton, D. C. 

 Darwin, Charles. 



1859. The Ongm ot hp. U( ^ .h.pt,,. 11 „ I IJ (..n-Mphi, .1 

 Distribution. 



1872. TheOiiginof .sp(<i<s ()tl. I .litiu,, J, ipiu 1 ,^ i .i i^iti.ht.^ 

 to Isolation a.ul to DivergennM.f Clmrartrr. 



1906. Inheritance in Poultry. Publishr,! l.v tlir ( •;.r,u"-ir liisiituiion 

 of Washington. D. V. 

 De Vriks, If. 



1905. l.xolmioiK racial and habitudmal. Published by the Carnegie 



