ARTESIAN WATER IN N. S. WALES AND QUEENSLAND. 429 
report prepared by Mr. J. W. Boultbee, on the “Artesian Water 
Supply of New South Wales. He has also to acknowledge having 
‘received much valuable information personally communicated to 
him by Mr. Boultbee. 
Since writing the above paper, the author has been informed of 
a curious phenomenon relating to oscillations of the hydraulic 
grade in New South Wales. Mr. E. F. Pittman, on the authority 
of Mr. T. T. W. Mackay, Acting Inspector of Stock, Wanaaring, 
informs him that at Urisino Station, a bore which has proved 
to be sub-artesian was sunk to a depth of 1,680 feet. The water 
in this bore now stands at a mean height of about seventeen feet 
below the surface, but rises and falls with a rhythmical pulsation 
for two feet on either side of this mean level every two hours, that 
is it is subject to a tide of four feet every four hours. 
Mr. J. W. Boultbee has also informed the author that a similar 
phenomenon has been observed on Urisino Station, at ninety-one 
miles on the Milparinka-Wanaaring Road in the water from a 
bore 2,000 feet deep. The water in this bore, which is also sub- 
artesian, is subject to six tides of about four feet each, every 
twenty-four hours. No explanation of these phenomena has as 
yet been afforded. 
The following are some recent observations of these tidal move- 
ments made by Mr. T. T. W. Mackay :— 
Depth to surface of water 
Time, below surface of ground. 
5°30 p.m. as ms ... 19 feet 24 inches 
735... WR oe ree yey CD bg! O10. 
90 ,, Seapine tii 8 Nagy POR vient Bio ag 
La ,; Meee On MGI DS aoc F2 Liisa, 
10 am. ame cae rca 1D a dda 
210 .., Lig Rg or ae 
BO, oh ES et a ee 
i... ee ee eG). 
90 4, ee 8! PAIGE gE TOT 
PICO is 5 in Te bie hovigak? ye 
12°45 p.m. ee a Ae OS) Re eee 
2°45 ,, Aes oe ANGE ME ix: * 
4°45 ,, vee ae ok whl AS) 3) 
