L6 



THE AMERICAN NATURALIST [ Vol. XLV1 



cerning the gai 

 this interesting 

 nant white side 



destroyed and he would have been a true albino. Some 

 of his germ cells seem to contain the antibody W in 

 quantity and distribution adequate to inhibiting the 

 quantitatively definite determiner for pigmentation 

 found m some of the gametes of many pigmented mares; 

 others of Ins gametes seem to lack this specific anti- 

 body, having in its place a determiner for dark pigmen- 

 tation, hence, he is apparently simplex with reference 

 to his dominant white determiners. If one of his 

 se^r P ? Ssessi t n ^ V U " it( s wit1 ' a ,naiv ' s - aim ' h ' 1^- 

 aer above referred to, 

 ke place or it will take 

 place incompletely— in the latter case resulting in some 

 modification of the solid-color coat and skin condition 

 If the mare's gamete possessing less of the pigmenta- 

 tion determiners than the optimum quantity above re- 



lV , ntr tt t- ,Mil, Hr il VT XVlnt " ,U)] f^ if't^erXtive 

 as to cause only inhibition; recessive. /. ''albinic'' if 

 reaction occurs. 



Let us consider the criteria of albinism. The general 

 conception among investigators and writers on the sub- 

 ject seems to be that all strains of albinos have origi- 

 lg from the germ-plasm deter- 



nated through 



miners for pig.uemauon previously possessed, rather 

 than to have descended from ancestral types never pos- 

 sessing such pigmentation. Generally an animal is 

 designated as "albino" when inhibition and reaction 



