SCIENCE AND REVOLUTION 



believe in them. The fact that we might not 

 be able to demonstrate that such agencies do 

 not exist would not relieve them of this bur- 

 den. But the assertions hitherto offered by 

 them are not proofs. In the third place, the dif- 

 ference between that which we can know com- 

 pared to that which we cannot know is not so 

 great, that it can defeat our endeavor to con- 

 trol the material forces of the universe. 



It is true that man as organized to-day can see 

 only that which is visible for him, hear only 

 what is audible for him, taste only that which 

 his tongue can discriminate, feel only that which 

 his touch can bring to his notice, smell only 

 that which his olfactory organs can detect, think 

 only that which is thinkable for his brain, and 

 know only that which is knowable to this brain 

 under such circumstances. But in the first place, 

 the human brain will not always remain organ- 

 ized as it is to-day. A comparison of the con- 

 struction and volume of the skulls of a Pithe- 

 canthropus, a Neanderthal man, an Australian 

 aborigine, and an educated Caucasian, is so con- 

 vincing, that the development of a vastly higher 

 organ of understanding out of the human 

 mind, in the course of further millions of years, 

 becomes a logical demand of materialist monism. 



168 



