12 SAVAGE SUEVIVALS 



spring, like other birds. But by selecting for 

 breeding purposes those hens that had a tendency 

 to lay more eggs man has developed breeds that 

 now lay eggs the year around. 



In the same way cows have been developed to 

 give milk for a year or two after the birth of a 

 calf, altho naturally, in the wild cows, milk is 

 produced for only a short time after the calf is 

 born and serves as food for the calf until it is able 

 to get its own food. By repeated emphasis of any 

 peculiarity, either of mind or body, it can be de- 

 veloped in time to an extent almost without limit. 

 It has been by this simple method of selection that 

 ' ' green roses ' ' have in these later times been pro- 

 duced, and the spineless cactus, and seedless 

 grapes, apples, oranges, bananas, and pineapples. 

 This process is called Artificial Selection, because 

 it is carried on by man. 



Science teaches us that it has been thru a 

 similar process of selection carried on by nature 

 and extending thru millions of years that all 

 of the different species of animals and plants ex- 

 isting on the earth have originated. The first ani- 

 mals were the lowest, and from these, thru 

 Natural Selection, operating thruout immeasur- 

 able periods of time, have arisen all the higher 

 animals, including man. 



3. The Dog. 



The dog is probably the oldest of human asso- 

 ciates. It was domesticated by man at a very 



