

C 



PREFACE 



Whoever claims to be an educated man, a man 

 who thinks, must acquire a knowledge of the 

 outline of modern scientific research and of the 

 theories concerning the descent of man. No 

 thought is so essential and sublime as that about 

 ourselves. One may be skeptical as to the value 

 of these things, but before any discussion of 

 them is possible, one must, above all, think. 



There must be no class distinction in view of 

 these questions. Wherever great philosophies 

 and movements in their interest have appeared 

 in history, they have not addressed themselves 

 merely to the kings of the spirit, but instinctively 

 to the simple man of the people, to that place 

 where the heart of the people is beating. Since 

 natural science to-day claims to offer a new basis 

 for a scientific world philosophy, it must again 

 address itself to the common people. It may 

 seem that scientific methods of expression and 

 thought are an obstacle to popularization. If so, 

 we must take so much the more pains to over- 



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