92 NATURAL SELECTION AND 



from their rudiments in the lower animals in 

 the same manner and by the action of the same 

 general laws as his physical structure, Mr. 

 Wallace refuses to follow him. He holds that 

 there is a " spiritual world," and that just as the 

 glacial epoch supervened on the geologic causes 

 previously in operation, so an " influx " from 

 this spiritual world has produced man's moral 

 sense, his mathematical, artistic and metaphy- 

 sical faculties. 1 He considers himself driven to 

 this supposition because he believes that these 

 faculties cannot be accounted for by natural 

 selection. Yet, after saying this, Mr. Wallace 

 declares at the very end of his book that " the 

 Darwinian theory, even when carried out to its 

 extreme logical conclusion, not only does not 

 oppose, but lends a decided support to a belief 

 in the spiritual nature of man. It shows us 

 how man's body may have been developed 

 from that of a lower animal form under the law 

 of natural selection ; but it also teaches us that 

 we possess intellectual and moral faculties 

 which could not have been so developed, but 

 must have had another origin ; and for this 

 origin we can only find an adequate cause in 

 1 Ibid. p. 463 ; comp. p. 476. 



