82 PRINCIPLES OF BREEDING. 



system, it is evident that one of the twins derived it 

 from one parent and the other twin from the other 

 parent ; — the parent not giving it, doubtless communi- 

 cating in each case, the vital or nutritive system." 



Where the parents are of different varieties or species, 

 Mr. Walker says, "The second law, namely, that of 

 CEOssiNG, operates where each parent is of a different 

 breed, and where, supposing both to be of equal age 

 and vigor, the male gives the hack head and locomotive 

 organs, and the female the face and nutritive organs." 



After giving numerous illustrations from facts and 

 many quotations from eminent breeders, he says, " thus, 

 in crosses of cattle as well as of horses, the male, except 

 where feebler or of inferior voluntary and locomotive 

 power, gives the locomotive system, the female the 

 vital one." 



W. C. Spooner, V. S., one of the most eminent au- 

 thorities of the present day on this subject, and writing 

 within the past year in the Journal of the Koyal Agri- 

 cultural Society, says : — "The most probable supposi- 

 tion is, that propagation is done by halves, each parent 

 giving to the offspring the shape of one half of the 

 body. Thus the back, loins, hind-quarters, general 

 shape, skin and size follow one parent ; and the fore- 

 quarters, head, vital and nervous system, the other ; 

 and we may go so far as to add, that the former in the 



