130 



MENDELISM 



CHAP. 



formation that is general and often vague. It may be 

 that the inheritance of skin pigmentation in this instance 

 is a genuine exception to the normal rule, but at the same 

 time it must not be forgotten that it may be one in which 

 several interacting factors are concerned, and that the 



9 



QXG? fxj 0x5 



wji^ 1 



vW w Several children 



all or O 



FIG. 29. , 



Pedigree of a family which originated from a cross between a Hindu and a European. 

 Black signs denote individuals as dark as average Hindus. Plain "signs denote quite 

 fair members, while those with a dot in the centre are intermediate. 



pure white and the pure black are the result of combina- 

 tions which from their rarity are apt to be overlooked. 

 But until we are in possession of accurate information it 

 is impossible to pronounce definitely, upon the nature of 

 the inheritance in this case. 



