236 PRINCIPLES OF STOCK-BREEDING. 



the head (and I believe the lower middle part also), 

 the cerebral, situated within the skull, immediately 

 above its junction with the back of the neck, and the 

 whole of the locomotive system (the bones, ligaments, 

 and muscles, or fleshy parts). The resemblance to that 

 parent is, consequently, found in the back-head, the 

 few more movable parts of the face, as the external 

 ear, under lip, lower part of the nose, eyebrows, and 

 the external forms of the body, in so far as they de- 

 pend on the muscles, as well as the form of the limbs, 

 even to the fingers, toes, and nails." x 



" It is a fact," says Mr. Walker, " established by 

 my observations, that, in animals of the same variety, 

 either the male or the female parent may give either 

 series of organs, as above arranged that is, either 

 forehead and organs of sense, together with the vital 

 and nutritive organs, or, back-head, together with the 

 locomotive organs." a 



" The second law, namely, that of crossing, oper- 

 ates where each parent is of a different breed, and 

 when, supposing both to be of equal age and vigor, 

 the male gives the back-head and locomotive organs, 

 and the female the face and nutritive organs." * 



" The third law, namely, that of in-and-in breed- 

 ing, operates where both parents are not only of the 

 same variety, but of the same family in its narrowest 

 sense, and when the female gives always the back-head 

 and locomotive organs, and the male the face and 

 nutritive organs precisely the reverse of what takes 

 place in crossing." 4 



1 Walker on " Intermarriage," pp. 142, 143. 



2 Loc. tit., p. 146. 3 Walker, loc. tit., p. 184. 4 Ibid., p. 204. 



