352 A. LIVERSIDGE. 
quantity of white insoluble matter had collected by that time at 
the bottom of the beaker. This was filtered off, dried, and fused 
with 100 grs. pure litharge, and suitable proportions of bitartrate 
of potash and carbonate of soda, the ashes of the filter also being 
added. The resulting button of lead was subsequently cupelled 
and yielded 2-01 grs. silver, or 1 lb. 1 oz. 2 dwts. 15 grs. troy per 
ton. A piece of new yellow metal with which the vessel was 
being repaired, yielded only 0 oz. 18 dwts. to the ton. 
Nina,” a brig just arrived in the Pacific from England. The 
experiments were performed as before with results:—1,700 ars. of 
the new metal kept in the cabin for possible repairs gave ‘051 grs. 
= 003% = 19 dwts. 14 grs. per ton.; 1,700 grs. from the hull, 
where it had been three years, gave ‘400 grs. = 023% = 7 om. 
13 dwt. | gr. per ton. 
The amount of silver in the new metal for the “Nina” and 
“Ana Guimaraens” are unusually low, being both under one 
ounce per ton. 
“ Bergman,” a piece from the hull gave 5 ozs. 16 dwts. 18 grs. 
per ton ; a piece from the cabin gave 4 ozs. 6 dwts. 12 grs. per tol. 
“ Parga,” 200 grs from a piece from the hull gave ‘072 grail, 
and a piece of fresh metal -050. 
“Grasmere,” only coppered a few months ; 610 grains from hull 
gave ‘075 and from the cabin -072 grain. 
Mr. Field remarks :—“ It will be observed that the amount of 
silver in the above specimens of fresh metal is very high, and itis 
probable that most of these are merely the re-rolling of masses 
metal melted down from old sheathing, and have derived the 
greater part of their silver from the sea on former occasions. It 
is well known that the copper used in the manufacture of y ellow 
metal is very pure, containing two or three dwts. of silver per 
frequently not so much, and silver is very seldom associated 
the other constituent, zinc. In order to arrive at more certalD 
results, however, I have granulated some very pure copper, reser” 
ing some in a glass stoppered bottle, and suspended the remainder 
4 
