8 THE METHODS AND 



heredity is thus represented we can hardly 

 avoid discovering, by mere inspection, one 

 of the chief conclusions to which genetic 

 research has led. For it is obvious that the 

 contributions of the male and female gametes 

 may in respect of any of the ingredients be 

 either the same, or different. In any case in 

 which the contribution made by the two cells 

 is the same, the resulting organism — in our 

 example the man — is, as we call it, pure-bred 

 for that ingredient, and in all respects in 

 which the contribution from the two sides 

 of the parentage is dissimilar the resulting 

 organism is cross-bred. 



To give an intelligible account of the 

 next step in the analysis without having 

 recourse to precise and technical language 

 is not very easy. 



We have got to the point of view from 

 which we see the individual made uj) of 

 a large number of distinct ingredients, 



