376 POPULAR SCIENCE MONTHLY. 



originally along the lines laid down by the climate and topography of 

 the glacial periods. But these indications of the actual courses of 

 migration are beyond the range of the immediate enquiry, and should, 

 therefore, be reserved for separate consideration. It is sufficient for the 

 present to have pointed out the possibilities of dispersion, which may 

 be summarized in conclusion as follows: From the skeletal parts of 

 Pithecanthropus we are assured that the pliocene precursor could 

 walk; the nature of his food-quest affords the wandering motive; the 

 widespread diffusion of quaternary culture convinces us of the fact of 

 dispersion ; and the data of geology define the routes provided by nature 

 for the original migrations of mankind. 



