INBREEDING. 105 



tical and so preventing the appearance of any 

 feature outside of the animals originally se- 

 lected; and second, that the in-and-in bred 

 animal is prepotent over any and every other. 



This latter proposition has been questioned 

 by some as only true when the animal has 

 special vigor, though in the main it is probably 

 approximately true. 



While recognizing the force of the claims 

 made for in-and-in breeding, some breeders 

 have been alarmed at the physiological dan- 

 gers besetting that course and have adopted a 

 modified view of the general theory generally 

 called "line breeding," a brief outline of which 

 will now be given. 



