GREATER DIFFICULTY IN HIS CASE. 277 



opponents to grant me a few more millions 

 of that cheapest of all commodities, past 

 years. I require this little extension to enable 

 me to make good my argument, because the 

 walrus differs far more from any known 

 animal, living or extinct, than does the 

 white from the brown bear ; also, I have 

 stated that I conceive the Polar bear to have 

 become a Polar bear by living on seals, and 

 it is therefore to be supposed that the seal and 

 the walrus were originated first. 



In reference to the fact of a black bear 

 having been seen swimming for hours with his 

 mouth open catching insects in the water, like 

 a whale, Mr. Darwin states (page 184) that, 

 &quot;Even in so extreme a case as this, if the 

 supply of insects were constant, and if better 

 adapted competitors did not already exist in 

 the country, he can 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.&quot; 



I see no difficulty in it either, but it is cer 

 tainly a very extreme case to put, and there is 

 much less difficulty in believing that the thing 



T 3 



