176 ALEX. L. DU TOIT. 



so that considerable pressures could be brought to bear 

 upon the enclosed water. 



It must be clearly pointed out, however, that this state 

 of affairs would be a purely local and impermanent feature; 

 the superinduced pressure would force the water laterally 

 into regions of lower potential, but, in view of the slow 

 rates of motion as we shall see, it is quite likely that a 

 state of abnormally high potential might prevail over a 

 certain tract until such time as relief would have been 

 afforded by diffusion. This would be indicated on the lso- 

 potential Map by the lowering of inclination or reversal in 

 the slope of the potential surface over the centre of the 

 limited region affected. 



There are several localities within the Basin where such 

 irregularities obtain, and it is noteworthy that immediately 

 to the north-east of Kynuna, the bore specially instanced 

 by Gregory, there lies a region of large flow and presumably 

 of high potential. On the other hand the fact that success- 

 ive supplies met with in bores almost invariably rise to 

 correspondingly increasing heights is capable of explanation 

 otherwise, either as being due to independent water-hori- 

 zons, having different potentials by virtue of different 

 heights of intake, or equally well as irregularly bedded 

 deposits fed through upward leakage from a single stratum 

 near the base of the artesian series. With the latter con- 

 ception a rapid rise in temperature might be expected in 

 going from the shallower to the deeper waters; this, as a 

 matter of fact is particularly well marked at Kynuna, 

 where the gradient near the bottom is about 1° F. in 10 feet. 



These are all points worthy of further investigation; 

 chemical analyses would be of additional assistance without 

 doubt. 



(3) Contrasts in density due to temperature differences. 

 — For general purposes, the density of the waters has been 



