SELECTION. 399 



cases have been animals of strong constitution, and 

 apparently free from inherited predisposition to dis- 

 ease. 



In the improvement of grades, as well as pure-bred 

 animals, the selection of breeding-stock must go hand- 

 in-hand with a judicious system of feeding and man- 

 agement, as the artificial characters which are im- 

 pressed by the male upon his offspring can only be 

 retained through the influence of essentially the same 

 conditions that originally produced them. 



