36 



Instincts. 



Intelligence. 



Variability. 



(3) As to quantity. 



Moderate variations. 

 Sports. 



Prevalence and Extent of Variation. 



That variation in wild species is not infrequent 

 nor always slight in amount pointed out by 

 Wallace, 



Foraminifera. 



Sea-Anemones. 



Nerita. 



Cassiopea, and other Medusae. 



Gulick's studies on the land shell of Oahu. 



Helix in France. 



Mollusca of Colorado. 



Insects. 



Milne-Edvvards's measurements Of lizards. 



Allen's measurements of birds. 



Variation in size i ^% to 20^. 



Each part varies independent of the others. 



Same result from Allen's measurements of 

 squirrels. 



Also Llovii Morgan's measurements of bats' 

 wings (Animal Life, pp. 63-75). 



Variation in internal organs. 



Beddard on earthworms. 



Skulls of orang-utans. 



Skulls of wolves and bears. 

 Batkson on the frequency of sports. 



