t*;i, 



m 



7i, 



'>"f.l!} is, 



w 



''f^fclWi.J 



wm 



X"^ 









} AU 







;,*>»»3ii».'l^-r. 









Fig. 236. Improved varieties of domestic animals 



The contrast between the modem high-bred Jersey and the ancient banting, or between 



the high-bred Russian wolfhound and an ordinary yellow dog, is typical of the changes 



brought about in the course of many generations by the steady work of selecting the most 



desirable kinds of individuals to be the parents of the following generations 



