PHOSPHATIC DEPOSITS IN THE JENOLAN CAVES. oat 
Free sulphur is also precipitated by the action of sodium sul- 
phide on any tetrathionate or ferric chloride in the liquor. In 
addition to Ag,S and free sulphur, the precipitate will also con- 
tain sulphides of Cu, Pb, Au, Fe, and Zn, with some Al,(HO), 
and CaCO,, which, after ignition of the precipitate, would be 
almost wholly converted into Al,O, and CaS. 
The Rivertree precipitates, after drying at a temperature which 
was sufficient to partially oxidise some of the sulphides, had the 
following composition :— 
(h.) 
Soluble salts es whe 4:36 per cent. 
Al,O, oe ae 2°41] - 
(Oe 85 i 
Ag 16°32 as 
Au “OUGies 
Pb 9-93 oe 
Cu 3°66 RS 
Fe . 98 “pf 
i ae oe a 2°87 . 
Sic. — “e. .. 65-84 us 
H,0, O and CO, 2°76 _ 
100-00 
In conclusion, it may be said that the Russell process offers a 
most interesting field for research to any chemist with the time at 
his disposal, the cause of the going-back of chlorinations especially 
needing elucidation. 
No. 6.—ON THE OCCURRENCE OF PHOSPHATIC 
DEPOSITS IN THE JENOLAN CAVES, NEW 
SOUTH WALES. 
By Joun C. H. Mineaye, F.C.S., Analyst to the New 
South Wales Department of Mines. 
(Read Saturday, January 8, 1898.) 
[ Abstract. | 
TuE phosphate deposits were found by Guide Wyburd in Katie’s 
Bower, Left and Right Imperial, Grotto Cave, and the Jubilee 
Cave—a branch of the Right Imperial Cave. 
