REMOVAL OF SILVER AND GOLD BY MUNTZ METAL. 355 
Silver. Gold. 
4 ozs. 15 dwts. 9-2 grs. per ton. 1 dwt. 2-4 grs. per ton. 
This sheathing was referred to in a paper on the “ Origin of 
Gold Nuggets,”! and was remarkable for containing a good deal — 
of iodine, but none of the other sheathings, since examined, have 
yielded any iodine. 
(a) From pile in Mr. Thomas Nobbs’ wharf at Ballina, N.S. 
Wales, between high and low water mark. Exposed four years 
‘to sea water. Corroded but not so deeply as (d). 
Silver. Gold. 
2000 grains gave 6 ozs. 9 dwt. 8 grs. per ton. 11-8 grs. per ton. 
Metallic copper 647. 
(6) From longitudinal brace in Ballina Government wharf, 
N.S. Wales, between high and low water mark, Exposed six 
years to sea water. 
Silver. Gold. 
-2000 grains gave 2 ozs. 2 dwt. 22 grs. per ton. 4°7 grs. per ton. 
Metallic copper 64°/, 
(c) From piles in Government wharf, Ballina, N. 5. Wales, 
between high and low water mark. Exposed six years to sea 
water. Not much corroded and fairly thick metal. 
Silver. Gold. 
4 7 2000 grains gave 3 ozs. 19 dwt. 5 ors. 19-6 grs. per ton. 
2158 grains gave 4 ozs. 5 dwt. 14 grs. Ldwt 7 grs.  » 
2394 grains gave 4 ozs. 12 dwt. Ogrs. 1ldwt. 22 gr 
Metallic copper 60°3%/, 
Th the last, the solution was made with sulphuric acid. 
(2) From the pile of Mr. Fenwick’s wharf, Ballina, N. S. Wales, 
wholly submerged for thirteen years in sea-water. 
So brittle as to break readily between the fingers, with a copper 
coloured granular fracture, hence in parts most of the zinc has 
4, 
1 Journ. Roy. Soc. N. 8. Wales, 1893, p. 331. 
