Page:Popular Science Monthly Volume 60.djvu/384

376 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.