EFFECT OF NATURAL SELECTION 89 
Our selection begins, therefore, where natural selection leaves 
off, and it aims to secure also the development of some part or 
faculty that is of special value to us. For example, nature would 
develop a sharp horn in cattle and perfect the instinct to hide 
the young at birth,! but it would not develop the milking process 
to a very high degree for the reason that almost any cow in a 
state of nature could give enough milk to satisfy her calf. 
Fic. 12. Old Dick, now fifty-six years old 
Natural selection develops the speed and endurance of horses, 
as also, very likely, their vision and the quality of the hoof, but 
it does not develop the size we need for draft purposes, nor 
bring out the action nor the teachableness we desire for driv- 
ing purposes. 
The agility of sheep and goats is rather overdeveloped in 
nature for our purposes, but the fineness of the fleece and length 
1 Every farmer boy knows that the cow will hide her calf, and if conditions 
are at all favorable, it will take a good hunt to find it. 
