348 A. LIVERSIDGE. 
Gold in Sea-water collected off Jervis Bay. 
(1) 2000 ce. treated with 1 gramme 
of FeSO, yielded ‘0001 gr. = 0-05 gr. per ton 
(2) Filtrate treated with ‘5 gramme 
FeSO, and NH, yielded 0002 gr.=07101 , 
Total -0003 0151 ‘4 
(1) 2000 cc. treated with 1 gramme 
lead acetate and precipitated 
by sheet zinc, yielded -0020gr. = 1-016 gr. perton 
(2) Filtrate treated with 1 gramme 
FeSO, and NH, yielded 0000gr.=0°000 5, 
Total -0020 1-016 
1000 ce. treated with chlorine, and then with 5 cc carbon disul- 
phide, to dissolve out any iodine or bromine which might have 
been set free; decanted 1 gramme lead acetate added and 
precipitated by zinc, yielded -0005 gr.=0°508 gr. per ton. 
1000 cc. treated with two grammes mercuric chloride for four 
days and then precipitated by H,S, yielded -508 gr. gold per ton. 
Experiments with other processes are now being carried out; 
but as they are not complete the results are deferred for a later 
paper, 
To test the ordinary Sydney water supply, collected over # 
sandstone area, 124 ths. weight of the laboratory tap water was 
tested for silver and gold by adding 100 cc. sulphurous acid, five 
grammes ferrous sulphate and allowing to oxidise for several = 
the iron hydroxide was then precipitated by ammonia 
and cupelled—but neither gold nor silver was found. 
The amount of gold obtained from sea-waters in the forge : 
experiments must necessarily be less than the total amount of 
gold present in the water, since it was found that know? quant 
ties of gold chloride solution added to distilled and sea-wate™ 
and then estimated by precipitation, scorification and cu! 
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