DEVELOPING CHARACTERS 199 



We shall find a range of differences in wild 

 plants, as great as the range of environments 

 in which they have grown. 



And we shall find a range of differences in 

 cultivated plants as great as the range of differ- 

 ences in races and nations and individuals who 

 have grown them. 



I saw an interesting illustration on the rela- 

 tion between heredity and environment at the cir- 

 cus one day. 



There, in a wire cage, was a tiny dog together 

 with a lot of monkeys. 



While I was watching, a trainer appeared and 

 snapped his whip. 



The monkeys quit their play with the dog, 

 ran around in a circle, and climbed up the wire 

 of the circular cage. 



The little dog followed them, but could not 

 climb. He would start up and drop back, start 

 up again and drop back again. 



Then he would look down at his feet, and if 

 a dog ever showed surprise, that dog did. He 

 seemed to be wondering why he could not climb 

 as monkeys do. 



The environment was there, but the heredity 

 was different. 



We see the same thing in plant life. The 

 sweet peas with their tendrils and the nas- 



