42 CATTLE-BREEDING. 



common as scarcely to deserve note when it 

 occurs. I recall one instance, for example, 

 where a red-roan bull was crossed on a well- 

 mixed roan cow and the product was a perfectly 

 white calf; and several similar cases where the 

 calves were red, which, on the whole, is more 

 remarkable since Short-horns exhibit a tend- 

 ency toward light colors in many cases. 



Mr. Darwin divides the observed cases as to 

 animals under two principal heads: First, the 

 reappearance of a lost character in pure breeds 

 after a number of generations; and, second, the 

 reappearance, where a cross has been made, of 

 some peculiarity of the animal used to effect 

 the cross which had not formerly occurred in 

 the cross-bred descendants, or which had been 

 early lost on a return to the use of a single 

 strain upon the descendants of the cross. 



Of the first class the not uncommon occur- 

 rence of small horns in well-bred Southdown 

 bucks long after the breed had been bred to a 

 hornless character is a widely-known example; 

 while of the second an instance is recorded by 

 Mr. Sidney, in his edition of "Youatt on the 

 Pig," of a Berkshire boar being used on an 

 Essex sow, the sows from which cross were 

 bred to pure Essex boars, but twenty-eight 

 years afterward a litter turned up containing 

 two pigs of well-marked Berkshire characteris- 

 tics, I have myself remarked in Kentucky 



