£. F. PITTMAN AND T. W. E. DAVID. CXXXIX. 
source to irrigate 136 square miles. According to the 
approximate data which we have already assumed, it should 
be possible to so increase the flow by multiplying the bores 
as to suffice for the irrigation of a vastly larger area; but 
the problem as to the extent to which the outflow can be 
increased without converting the artesian into sub-artesian 
wells, is one which can only be satisfactorily solved by a 
hydraulic engineer, who is at the same time an able physicist 
and mathematician, and one provided with ample oppor- 
tunities for investigation. It is very desirable that such 
an investigation should be undertaken with as little delay 
as possible. 
‘ 
VIII. SUGGESTIONS FOR OBTAINING MORE ACCURATE 
KNOWLEDGE OF OUR ARTESIAN WATER Suppiy.—(1) We 
would recommend the appointment of a thoroughly com- 
petent hydraulician with the qualifications just mentioned, 
to study accurately the flow of the different bores, its 
variation at stated intervals, and of the peculiar phenomena 
observed at the Urisino Bore, as well as the pressure and 
the altitudes of the bores. It is quite possible that subse- 
quent investigation will show that many others, if not all, 
the bores are subject to the same tidal movements which 
characterise Urisino. In case of bores in which the flow 
is artesian instead of sub-artesian as at Urisino, this can 
probably be determined by periodic variations in pressure. 
(2) We would recommend that accurate gaugings be made 
of the flow of rivers (a) just above where they reach the 
edge of the intake beds, and (b) just where they leave the 
intake beds. The difference in the amounts, at these two 
respective positions will give the approximate amount of 
leakage of river water into the porous (intake) beds, and 
will so afford data for estimating what quantity of water 
derived from this source, must be added to that due directly 
to rainfall on the porous beds, in order to estimate the total 
