48 THE NEANDEETHAL SKULL. 



bits decrease and the number of hares 

 increase, the dog would be driven to catch 

 more hares, the less fleet ones would be 

 rigidly destroyed. I see no reason to 

 doubt that those causes in thousands of 

 generations would produce a marked effect. 

 ... In North America, the black bear 

 was seen by Hearne swimming for hours 

 with a widely-open mouth ; thus catching 

 almost like a whale insects in the water. / 

 see no difficulty in a race of bears being 

 rendered by Natural Selection more and more 

 aquatic in their structure and habits, with 

 larger and larger mouths, till " a creature 

 was produced as monstrous as a whale"* 



For some unexplained reason this in- 

 structive specimen of the Transmutation 

 theory, by which Natural Selection evolves 

 a whale from a black bear, was omitted 

 after the first edition, possibly because a 

 deeper study of the subject increased 

 rather than lessened Mr. Darwin's " diffi- 

 culties." Though in the case of pigs being 



* Darwin's Origin of Species, p. 184. 



