QUANTITY 133 



into grades, of which the following are indicated : 3-0, 

 3-2, 3-4, 3-6, 3-8, and 4*0, and other data suggest that 

 the grades continue on with similar gaps beyond 5 

 per cent. It has not been possible to follow this clue 

 with precision, however ; but that there are grades and 

 factors to produce them is obvious. We shall consider, 

 first, a case in which the daughters were no better and, 



LU 

 CO 



3 



LiJ 



o 

 < 



H 

 Z 



LLl 



o 



oc 



UJ 



Q. 



2 8 29 3031 -2 -3 4 5 6 7 8 -9 40 1 -2 -3 -4 -5 -6 -7 8 -9 

 PERCENTAGE OF FAT IN THE MILK 



next, several in which the daughters were better and 

 still better than the dams. In Mr. Christensen's volume 

 on the Lombjerge sires, Lombjerge IV, the head of 

 the line, is credited with 41 daughters ; and, while the 

 average quality of the dams' milk was 3*51, that of the 

 daughters was 3*48. The following diagram shows the 

 quality of milk given by each cow and her daughter : 

 the plotting being horizontal for the dams and perpen- 



