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ALEX. L. DU TOIT. 



from a local intake, or is due to another cause is not clear. 

 From Kynuna the gradient falls regularly towards the 

 south-west (corroboration of this has been given by F. J. 

 Calvert, II, pp. 175-7), but between Kynuna, Richmond and 

 Winton, there extends a region that appears to have an 

 abnormally high potential. Actual pressure readings are 

 absent, but, from the large flows either measured or esti- 

 mated on Quambeytook, Sesbania, Albion Downs, Dagworth 

 Resumption, Hamilton Downs, etc., reduced to pressures 

 by the aid of Table B, this seems to be a tract possessing 

 potentials of from 800 to perhaps over 1000 feet; reliable 

 measurements of pressures over this bit of country would 

 be very welcome. 



A curiosity again is the belt of low potential running 

 down from the Dividing Range past Muttaburra to Bimerah, 

 and its extremely low value in that excessively deep bore. 

 In the S.E. the isopotentials indicate a fall of head towards 

 the W.S.W. in the Moree district, aud towards the W. and 

 even a little N. of W. around Ooonamble. The static pressure 

 originally recorded for Munna Munna (117 lbs.) gave a 

 potential of from 100 to nearly 200 feet higher than the 

 surrounding bores, a matter of extraordinary interest. A 

 lesser patch of high potential is found about Trialgara near 

 by, and a more important one at Goondablui on the State 

 border. There is a peculiar curving tongue of low potential 

 extending from Wilby Wilby to Bourke, while between it 

 and Barringun there stands an isolated tract of high poten- 

 tial with Lila Springs at its centre. 



Concerning the central part of the Basin, nothing seems 

 to be known, but the existence of bores on the extreme 

 west with potentials well above 500 feet, shows that, if 

 this remote quarter does not form an out-lying and de- 

 tached region, then there must be a long narrow tongue 

 of high potential extending westwards from Thargomindah, 

 along which the hydraulic gradient will be low. 



