36 



Journal of Agricultural Research 



Vol. XV, No. I 



the switch is separate in its behavior from the rest of the tail. These areas 

 will be studied separately. The cases of the ring just above the switch 

 and of the whole tail white will not be studied, as these marks are not 

 present in the herd. The choice of the broad quantitative group lies in 

 a study of the length of those white areas. The length of the white area 

 on the tail was measured and found to be between one-third and one-half 

 the total length of the tail. The data have been considered on the basis 

 of this and made two qualitative groupings: (i) half white and (2) solid 

 color (Table XVIII). 



Table XIX. — Pedigree of Lassie of M. F. 



The general conclusion from these data is that white on the tail is 

 generally suppressed in the offspring when the animal bearing it is 

 crossed with a solid-color animal. In this, also, there are some of the 

 same irregularly behaving individuals which appeared in the previous 



