Wilson — Inheritance of Quantity and Qualitij in Coivs' Milk. 479 



DiAGKAM 6. 



Diagram showing the percentage numbers of cows giving 

 of their milk. 



different yields and the qualities 



so 51 32 



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 tlieir milk be poor, and thus to increase 

 the proportion of poorer milk among them. 



SCIENT. PROC. R.D.S., VOL. XII., NO. XSXV. 



3v 



