294 



and also the line of their advance through Asia, which is 

 exactly that of the Molluscs, Birds, etc. 



The Diagonal lines represent the territory still occupied by the 

 Mongolians. 

 Fig. io. — Map showing the European distribution of the flowering 

 plants, and displaying the identity of their routes of dispersal 

 with that of other plants and animals (after Prof. Drude). 



The Black area indicates the regions now occupied by the domi- 

 nant flora of North Central Europe, which is advancing east 

 by the same route as that travelled by animal life. 



The Diagonal lines represent the " West Siberian " flora, which 

 is in process of expulsion by the North Central European flora. 



The weaker Mediterranean type is shown by oppositely drawn 

 Diagonal lines, and the Vertical lines indicate a more feeble 

 extension through Asia Minor. The Horizontal lines represent 

 the Central Asiatic flora. 

 Fig. II. — Map showing the relative geographical positions of theEuropean 

 or white races and the Mongolian or yellow races in the 

 ñfteenth century (slightly modified after Haeckel). 



The Black area indicates the area occupied by the European or 

 white race, and shows their eastward progress to be by pre- 

 cisely the same route as that followed by all other forms of life. 



The Diagonal lines show the region then dominated by the 

 Mongol tribes. 



