RELATIONS AND SURROUNDINGS. 153 



parents? What qualities does this condition tend to 

 produce in the parents? 



19. What is meant by "mutation"? In what way 

 does it bear on the question of the origin of adaptation? 



170. Derive and Define the Following Terms. Adapt- 

 ability; encystment; hibernation; commensalism ; sym- 

 biosis; colony; community; society; mimicry; carnivorous. 



