THE ORIENTAL MIGRATION. 285 



migrants in their westward and also in their later 

 northward travels. In a similar way species of plants 

 and animals of Alpine origin might have joined these 

 migrants in their northward course, and it is only 

 when we come to carefully analyse the constituent 

 parts of all these members which have come to us in 

 England from the south, that we realise the com- 

 plexity of their origin. Finally, even the Siberian 

 migrants mingled with the later Oriental ones, and 

 in some cases the decision as to whether a certain 

 species belongs to the former or to the latter migration 

 becomes a matter of great difficulty. 



SUMMARY OF CHAPTER VI. 



LIKE the last chapter, this deals with the Asiatic migrants. 

 But while the former described the history of the northern 

 invasion, those animals which entered Europe from the south- 

 east are here more particularly referred to. They originated in 

 Central, Southern, and Western Asia. It is not easy to dis- 

 criminate in all cases between this Oriental migration and the 

 Siberian. To a certain extent, even an entry of Northern 

 Asiatic species has taken place by the southern route, and 

 vice versa. On the other hand, southern species might have 

 come to Europe by the southern route that is to say, to 

 the south of the Caspian and also by the northern, which 

 lay to the north of that great inland sea. The Red Deer is a 

 good example. It arrived on our continent by both routes. 

 However, there is a racial difference in the members of the two 

 migrations. The small race now found in Corsica, Sardinia, 

 North-west Africa, and Western Europe, is probably the older 



