408 J. MILNE CURRAN. 
almost wholly of sanidine, so disposed as to be described as a pan- 
idiomorphic sanidine trachyte. I exhibit micro-photographs of 
the rock herewith. Some of the Canoblas rock resembles this 
trachyte. On the western slopes of the Canoblas a wall of trachyte, 
standing some fifty feet above the surface, can with difficulty be 
distinguished from the same rocks at Coonabarabran. 
Associated with the trachytes of Timor is a rock that I can 
only describe as an enstatite-andesite. A rock similar to this 
too is largely developed on the Canoblas. I am at present 
engaged on an exhaustive examination, chemical and microscopical, 
of the rocks mentioned herein, and take this opportunity to record 
their occurrence, and exhibit characteristic photographs. 
In addition to the rocks named, I exhibit a fine specimen of the 
acidic lava known as rhyolite from the Canoblas. It is the first 
example I have met of a rhyolite in situ amongst Tertiary rocks 
in Australia. Rolled blocks of a somewhat similar rock are 
found in the Tumberumba valley. 
Ox THE OCCURRENCE or ARTESIAN WATER in ROCKS 
OTHER THAN CRETACEOUS. 
By Epwarp F. Prrraay, A.R.8.M., Government Geologist, N.S.W. 
[Read before the Royal Society of N.S. Wales, December 4, 1895.] 
In September last I had the honour to report, to the Hon. the 
Minister for Mines, the discovery of paleontological evidence 
proving that artesian water occurs in rocks of greater age than 
the Lower Cretaceous sediments, to which it had hitherto been 
supposed to be confined, and the object of the present paper is © 
place upon the records of this Society a brief account of the facts 
referred to, together with some additional evidence gathered dur 
