284 Kvolut'ion of Morals. 



minds: we are bound to invstTvi- and sustain life; in all creatures- 

 wliich do not interfere with or detract Ironi fulness of lilc in the 

 totality of thinf^s — taking into account, of course, the quality of 

 life as judged by an evolutionary standard. This law makes it 

 our duty to destroy those creatures which impede human advance- 

 ment, as it is our duty to exercise protection and kindness toward 

 our i)oor relations of the animal world, who are helpers of man- 

 kind. Animals, indeed, are not moral, as I have declared. Neither 

 was i)rimitive man. But animals are on the road toward the 

 moral. The moral is but man's self-conscious recognition of laws 

 that reach all the way down, through the brute to inanimate 

 nature. I fail to see that the moral sense is in any way discredited 

 by being explained, as the intuitionalists assume. The evolutionary 

 sanctions of morality seem to me quite as imperative as those of 

 the metaphysicians. 



