ANIMAL BREEDING 211 



better than any of his predecessors at the Zoo. In 

 common parlance we should state that this young 

 gorilla has become acclimatized. This is undoubtedly 

 true — by his continual exercise his natural resistance 

 has been raised to such a level that he can withstand 

 our climate without succumbing to the ills which 

 afifect gorillas in captivity. 



Such animals frequently contract pneumonia and 

 die. As we have shown elsewhere, a low resistance 

 to cytost is a predisposing cause of respiratory in- 

 fections. It will be interesting to watch the New York 

 gorilla during the next five or ten years. If during 

 this period he escapes the various respiratory infec- 

 tions, may we not attribute it in part to an increased 

 resistance to cytost developed as a result of his un- 

 orthodox unbringing at the New York Zoo? 



