We ee ae 
GOLD AND SILVER IN SEA-WATER,. 339 
2. Neither is all the gold extracted by one treatment of the 
film with chlorine water. 
3, Some of the gold is left on the dish in evaporating the 
chlorine water solution. 
4, Several days and even weeks were required, in many cases, 
for the colour reaction to appear. 
Gold in Sea-water along the Coast of New South Wales. 
Next a set of experiments was made upon water collected out 
at sea; twelve samples, two Winchester quarts of each, were 
kindly collected for me by Captain Hutton, of the N. S. Wales 
Government steamer “Thetis,” by direction of Mr. C. W. Darley, 
then Engineer-in-Chief for Harbours and Rivers, to whom my 
thanks are due for the ready assistance he has given me in this 
and other similar matters. Prior to being sent out, the bottles 
were carefully cleaned, numbered and packed in cases (each hold- 
ing two bottles) so as to ensure purity and prevent error, and each 
bottle was rinsed with sea-water when about to be filled. 
Southern Sea- Waters. 
In examining the southern sea-waters, in the first batch, a litre 
(teach was treated and. the characteristic reaction for gold 
obtained from Nos. 1, 2, 4, 5, and 6. In the next batch of two 
litres each, 1, 2, 3, and 5, showed the presence of gold ; the films 
were treated a second time with chlorine water, when Nos. 3, 4 
and 5, gave the gold reaction. In the third batch, Nos. 1, 2, 3, 
and 6 reacted for gold, and on a second treatment Nos. 3 and 6 
again gave the reaction for gold. The details are as follows :— 
No. 1, South—Collected 26th November, 1894, one mile east 
of South Head Lighthouse. Latitude 33° 43’ 8. 
Test No, 1. -Upon one litre. SnCl, was added on December 
11th, 1894, a white sediment was formed; this, on February 8th, 
1895, had changed toa slate colour: the slate colour was probably 
due to the presence of gold. 
Test No. 2, Upon two litres. December 22nd, 1894, the white 
Precipitate on February 8th, 1895 showed a pinkish ringat upper a 
