350 A. LIVERSIDGE. 
Tut REMOVAL or SILVER anp GOLD rrom SEA-WATER 
spy MUNTZ METAL SHEATHING. 
By A. LIversIpDGE, M.A., F.R.S., 
Professor of Chemistry, University of Sydney, N. 8. Wales. 
[Read before the Royal Society of N. S. Wales, October 2, 1895.] 
Amoncst the writers upon the occurrence of silver in sea-water, 
we have Malaguti, Durocher, and Sarzeaud in 1850, Fred. Field in 
1856, and Forchhammer in 1865, and as it is difficult for many, 
especially in this part of the world, to obtain or see the originals, 
I quote the following extracts from their papers. None of them 
make any mention of the presence of gold in sea-water of of its 
removal. 
The following extract is from a paper by Messrs. Malaguti, 
Durocher et Sarzeaud, entitled—-Recherches sur la présence du 
plomb, du cuivre et de Vargent dans Veau dela mer et sur Peaistence 
de ce dernier métal dans les plantes et les étres organiques.” 
“ Estimation of silver in sea-water.—A considerable quantity 
of sea-water was taken from off the coast of St. Malo, 4 i 
leagues from land, and preserved during the course of the expert 
ments in a wooden cistern, from which it was taken out as occasion 
required, in glass vessels. The presence of silver in this water 
was first demonstrated by the sulphuretted hydrogen process above 
described ; but in order to obtain a more exact estimation of the 
quantity, fifty litres of the water were evaporated to dryness, and 
the crude salt thence obtained, weighing 1,300 grammes, ¥%® 
divided into thirteen equal portions, and each portion fused with 
thirty grammes of pure litharge and 1:13 grms. of lamp-b oe 
This mixture, which was made very intimate by long trituratio® 
in a porcelain mortar, was gradually heated to dull redness 10 4 
1 Journ. Chem. Soc. m1., 1851, pp. 69-70, extracted from Ann. Ch 
Phys. (3) xxvirt., 129, 
