WORLD'S TIMBEE EESOURCES 217 



beyond the watershed some distance inland, its 

 limits being clearly marked by a greater rain- 

 fall and a more temperate climate. Thus, in 

 Western Australia, the great belt of ' Jarrah, 

 some 350 miles in length by 50 to 100 in breadth, 

 which stretches eastward from the Darling 

 Ranges, has two distinct but narrow belts of 

 Tuart and Red Gum between it and the coast. 

 Within the extensive tract of Jarrah, in the 

 extreme south-western part of the colony, is 

 the main Karri belt, stretching from Cape 

 Hamehh to Torbay, and lying between 115° and 

 118° east longitude and 34° and 35° south 

 latitude. This region, in which the Jarrah, 

 Karri, Tuart and Red Gum are the dominant 

 trees, has an annual rainfall varying from 35 

 to 40 inches. In the somewhat drier districts 

 stretching eastwards of the Jarrah belt, there is 

 a fairly wide strip of White Gum enclosing a 

 narrower belt of York Gum, which, as regards 

 its northern and southern Hmits, is almost 

 coterminous with the Jarrah. Eastward of this 

 again, and the arid region, where the annual 

 rainfall is some fourteen inches and under, is 

 entered, and the forest rapidly dwindles, chang- 

 ing first to a poorer growth of White Gum, until, 

 in the sandy wastes of the gold-fields region, 

 the vegetation changes to brushes, scrubs and 

 dwarf trees, the latter being chiefly the Eucalypts, 



