Brasiliensis), growing along the river courses in the yungas regions of the north, though manicoba rubber is also obtained from Manihot Glaziovii on the drier uplands.
Vegetation ascends on the drier and less snowy mountain slopes of Tibet to above 18,00o ft.
The tierra caliente zone of the coast is tropical, humid, and unfavourable to Europeans, while the inland plateaus vary from subtropical to temperate and are generally drier and healthful.
The middle zone, called the caa.tinga or agreste region, has a drier climate and lighter vegetation.
There is hardly any seasonal change to be observed, and the dampness of the climate causes the heat to be more oppressive than are higher temperatures in drier climates.
Owing to the prevalent dry easterly winds from the arid plains of north Australia, Timor, like Ombay, Flores and other neighbouring islands, has a much drier climate, and a poorer vegetation, than islands further west, and has few perennial streams and no considerable rivers.
The impenetrable shady forests of the Malay peninsula and eastern Bengal, of the west coast of the Indian peninsula, and of Ceylon, offer a strong contrast to the more loosely-timbered districts of the drier regions of central India and the north-western Himalaya.
European fruit trees and vines flourish in certain localities, while in the drier regions the Australian wattle, gum trees and pepper trees have been introduced with success.
The works as subsequently maintained by the Thames Conservancy ensure an efficient head of water during the drier seasons of the year, and facilitate the escape of winter floods.
Of annual rainfall trends a little east of northward near the 97th meridian, and if a boundary must be drawn where nature presents only a gradual transition, this rainfall line may be taken to divide the drier plains from the moister prairies.