50 PRINCIPLES OF BREEDING. 



''It has been noticed that a well bred bitch, if she 

 have been impregnated by a mongrel dog, will not 

 although lined subsequently by a pure dog, bear thor- 

 ough-bred puppies in the next two or three litters."* 



The like occurrence has been noticed in respect of 

 the sow. " A sow of the black and white breed became 

 pregnant by a boar of the wild breed of a deep chestnut 

 color. The pigs produced were duly mixed, the color 

 of the boar being in some very predominant. The sow 

 being afterwards put to a boar of the same breed as 

 herself, some of the produce were still stained or marked 

 with the chestnut color which prevailed in the first lit- 

 ter and the same occurred after a third impregnation, 

 the boar being then of the same kind as herself. What 

 adds to the force of this case is that in the course of 

 many years' observation the breed in question was 

 never known to produce progeny having the slightest 

 tinge of chestnut color. f 



The above are a few of the many instances on record 

 tending to show the influence of a first impregnation 

 upon subsequent progeny by other males. Not a few 

 might also be given showing that the same rule holds 

 in the human species, of which a single one will suffice 

 here: — ''A young woman residing in Edinburgh, and 



* Kirke's Physiology. 



t Philosophical Transactions for 1821. 



