. GENESIS OF MAN, INTELLECTUALLY 



remoteness, in speciality and generality, in com- 

 plexity, in definiteness, and in coherent organi- 

 zation. 



The extension of the correspondence in space 

 is a marked characteristic of intellectual pro- 

 gress, which we have already traced through the 

 ascending groups of the animal kingdom, but 

 which is carried much further by man than by 

 any lower animal. It is no doubt true that the 

 direct adjustments of psychical relations to dis- 

 tant objective relations, effected by unaided per- 

 ception, have a narrower range in civilized men 

 than in uncivilized men or in several of the 

 higher mammals and birds. It is a familiar fact 

 that the senses of civilized man — or at least the 

 three senses which have a considerable range in 

 space — are less acute and less extensive in range 

 than those of the barbarian. It is said that a 

 Bushman can see as far with the naked eye as 

 a European can see with a field-glass ; and cer- 

 tain wild and domestic birds and mammals, as 

 the falcon, the vulture, and perhaps the grey- 

 hound, have still longer vision. Among the 

 different classes of civilized men, those who, by 

 living on the fruits of brain work done indoors, 

 are most widely differentiated from primeval 

 men, have as a general rule the shortest vision. 

 And the rapid increase of indoor life, which is 

 one of the marked symptoms of modern civili- 

 zation, tends not only to make myopia more 

 ^7 



