253 
By agitating the sand in water and decanting the suspended material, a 
very great improvement in the quality of the sand for glass-making was 
effected, as the analysis after washing shows, viz. 
Silica 
Alumina ... 
Ferric Oxide 
Magnesia 
Titanic Oxide 
Loss on ignition ... 
... 98.85 
0.50 
0.13 
trace 
0.37 
0.13 
99.98 
In the process of washing and decanting a loss of 6 per cent, was made, 
but the quality of the sand was much improved. 
The slimes consisted of: — 
Silica 
Alumina ... 
Water 
90.72 
7.16 
2.12 
100.00 
Sand containing 98.85 per cent, of silica should meet the requirements 
tor manufacturing the finer quality of glass, and the attention of those 
engaged in glass-making might be drawn to the fact that such material 
occurs in abundance on a railway line and within 40 miles of Melbourne. 
[24.4.08.] 
LIMESTONE AT TALLENT'S HILL, CURDIE’S RIVER, NEAR 
TIMBOON, AND AT KAWARREN, NEAR COLAC. 
By E. J. Dunn , F.G.S., late Director , Geological Survey. 
Tallent’s LIill. 
Curdie’s River, where the railway crosses it, is about 150 feet above 
sea level. The river-bed consists of calcareous Tertiary strata, and these 
continue to the highest points of the ridges and bluffs that border the river 
and rise quite 200 feet above it. The whole of the country bordering the 
river consists of these calcareous beds. 
Some of the beds are earthy in character and could be dug out; others 
are of firmer texture, and appear to be of better quality. No sandstones, 
arenaceous beds, nor any clayey beds were observed in the neighbourhood. 
There is an unlimited quantity of limestone in the parish of Timboon, but 
it appears to be all privately owned in the vicinity of the railway. 
In view of the enormous demand that must arise in the northern and 
north-eastern portions of the State for lime for agricultural purposes, this 
limestone area is an incalculable asset, and should be opened up in an 
extensive manner and with a view to furnishing the lime at a low cost. 
Excellent sites for kilns occur on both sides of the railway from the 
saw-mills southward, but to decide upon the most favorable site for 
economical and extensive operations would require exhaustive tests of the 
limestone in order to determine where it is of the best quality, most 
abundant, and most accessible. 
