200 ZOOLOGICAL GEOGRAPHY. [part hi, 



mountainous, and much of their surface considerably elevated. 

 Further east we have all European Turkey and Greece, a 

 mountain region with a comparatively small extent of level 

 plain. In Asia the whole country, from Smyrna through 

 Armenia and Persia to the further borders of Affghanistan, is a 

 vast mountainous plateau, almost all above 2000, and extensive 

 districts above 5000 feet in elevation. The only large tract of 

 low-land is the valley of the Euphrates. There is also some 

 low-land south of the Caucasus, and in Syria the valley of the 

 Jordan. In North Africa the valley of the Nile and the coast 

 plains of Tripoli and Algiers are almost the only exceptions to 

 the more or less mountainous and plateau-like character of the 

 country. Much of this extensive area is now bare and arid, 

 and often even of a desert character ; a fact no doubt due, in 

 great part, to the destruction of aboriginal forests. This loss 

 is rendered permanent by the absence of irrigation, and, it is 

 also thought, by the abundance of camels and goats, animals 

 which are exceedingly injurious to woody vegetation, and are 

 able to keep down the natural growth of forests. Mr. Marsh 

 whose valuable work Man and Nature gives much information 

 on this subject) believes that even large portions of the African 

 and Asiatic deserts would become covered with woods, and the 

 climate thereby greatly improved, were they protected from 

 these destructive domestic animals, which are probably not 

 indigenous to the country. Spain, in proportion to its extent, 

 is very barren ; Italy and European Turkey are more woody and 

 luxuriant ; but it is perhaps in Asia Minor, on the range of the 

 Taurus, along the shores of the Black Sea, and to the south of 

 the Caucasus range, that this sub-region attains its maximum of 

 luxuriance in vegetation and in animal life. Erom the Caspian 

 eastward extends a region of arid plains and barren deserts, 

 diversified by a few more fertile valleys, in which the charac- 

 teristic flora and fauna of this portion of the Palaearctic region 

 abounds. Further east we come to the forests of the Hindoo 

 Koosh, which probably form the limit of the sub-region. 

 Beyond these we enter on the Siberian sub-region to the north, 

 and on the outlying portion of the Oriental region on the south. 



