E. F. PITTMAN AND T. W. E. DAVID. CXXIX. 
area. By far the greater number of the bores in this area 
have succeeded in striking artesian water. The failures 
have proved most numerous in the southern portion where 
it approaches the Darling River. 
The deepest part of the artesian basin and that which 
also yields the largest flows of water lies within the area 
between Brewarrina, Dubbo, and Yetman.’ Hitherto the 
number of bores in this area are far fewer than in the one 
just described. The most southerly of the flowing bores 
are those of Warren and Gilgandra. 
As regards surface levels these have been determined, 
in most cases, only very approximately. At Moree the 
level of the plain is 680 feet, at Bourke the level of the 
plain is 350 feet above the sea, so that there is a surface 
fall from Moree to Bourke in a distance of about 240 miles, 
and in a direction about west by south, of about 330 feet. 
As regards the surface levels of the western part of the 
artesian area, the altitude of Mount Poole above the sea 
is about 900 feet, as determined by aneroid; and the top 
of Mount Poole is about 500 feet above that of the sur- 
rounding plains. The level of the plains in this neighbour- 
hood is consequently about 400 feet above the sea. The 
surface fall therefore from Mount Poole easterly to Bourke, 
a distance of 250 miles is only about 50 feet. 
Temperature of water flowing from New South Wales 
artesian wells.—The average temperature of the water 
flowing from 48 Government bores is 107° 81 Fahr., and the 
average depth 1,795 feet. If the mean surface temperature 
be assumed to be 68° Fahr., there is an average increase 
of temperature due to depth of 1° for every 44 feet. 
Chemical composition.—The following may be quoted as 
examples of the composition of the artesian water respec- 
+ See the Mineral Resources of New South Wales by Edward F. Pitt- 
man, section opposite p. 461. 
9—July 20, 1903. 
