Wilson — Inheritance of Quantity and Quality in Cows' Milk. 47i> 



Diagram 6. 



Diagram showing the percentage numbers of cows giving different yields and the qualities 

 of their milk. 



It will then be seen how substantial is the agreement among all four 

 divisions. It might be objected that the line representing the cows giving 

 700 gallons bends a little more to the left than the others, both in rising and 

 descending; but this does not substantially modify the general result. 

 Indeed it may lend emphasis to it, since there is a tendency among farmers 

 to retain good-yielding cows, even if their milk be poor, and thus to increase 

 tlie proportion of poorer milk among them. 



