144 PIONEERS OF EVOLUTION. 



systems, all closely correspond to those of other 

 mammals, and are often almost identical with them. 

 He possesses the same number of limbs, terminating 

 in the same number of digits, as belong fundamental- 

 ly to the mammals. His senses are identical with 

 theirs, and his organs of sense are the same in num- 

 ber and occupy the same relative position. Every 

 detail of structure which is common to the mammalia 

 as a class is found also in man, while he differs from 

 them only in such ways and degrees as the various 

 species or groups of mammals differ from each other. 

 He is, like them, begotten by sexual conjugation; 

 like them, developed from a fertilized egg, and in 

 his embryonic condition passes through stages re- 

 capitulating the variety of enormously remote an- 

 cestors of whom he is the perfected descendant. 

 Full-grown, he appears as most nearly allied to the 

 anthropoid or man-like apes; so much does his 

 skeleton resemble theirs that, comparing him with 

 the chimpanzee, we find, with very few exceptions, 

 bone for bone, differing only in size, arrangement, 

 and proportion. 



Mr. Wallace, therefore, rejected the idea of man's 

 special creation " as being entirely unsupported by 

 facts, as well as in the highest degree improbable." 

 But he would not allow that natural selection explains 

 the origin of man's spiritual and intellectual nature. 

 These, he argues, " must have had another origin, 

 and for this origin we can only find an adequate 

 cause in the unseen universe of Spirit." More de- 



