Page

2. Application of the Scale for determining the Weight of Gold

Globules obtained in Quantitative Assayings

340

Table, adapted to HARKORT's and PLATTNER'S Scales, of the con-

tent of Silver and Gold in an Assay-Globule, in loths, and cen-

tesimals

342

III. THE COPPER ASSAY:-

TA. Ores, Minerals, Products of Furnaces and Manufactures :-

a. Examination of such as contain Volatile Ingredients ...

b. Examination of substances containing the Copper in an oxidized

state, either pure, or combined with Acids and Water, or vitri-

fied with earthy constituents, et cetera.

344

349

TB. Metallic Compounds :-

a. Examination of Alloys of Copper and Lead

352

...

...

b. Examination of Alloys composed of Copper, Iron, Nickel, Cobalt,

Zinc, and Bismuth, in which the Copper is combined with one

or several of these metals, and frequently with lead, antimony,

and arsenic

a. Affinage of the Impure Black Copper prepared on a large scale

from Cupriferous Lead Ores

B. Affinage of the Black Copper obtained by the treatment, on a

large scale, of Sulphide of Copper, Copper-slate, and non-plom-

biferous ores in general

356

7. Determination of the Percentage of Copper in German Silver, and

in other Nickeliferous Compounds containing little or no Lead

c. Examination of Alloys of Copper and Antimony

d. Examination of Alloys of Copper and Tin

357

a. Examination for Lead in Minerals, Ores, and Products of Smelt-

ing Works, containing this Metal combined with Sulphur :-

b. Estimation of the Lead in Minerals, Ores, and Artificial Products,

containing this Metal in the state of Oxide, combined with

Mineral Acids

c. Method of estimating the value of Lead in Products of Smelting

Works, and other artificial substances, containing Lead in a

pure oxidized state, or only combined with Vegetable Acids 374

d. Method of estimating the value of Lead, in Minerals containing

this Metal alloyed with others

V. DETERMINATION OF TIN :-

...

374

a. Determination of Tin in Minerals, Ores, and Artificial Products,

in which the Tin is combined with Sulphur

b. Determination of Tin in Minerals and Products, containing this

Metal in an oxidized state

...

382

c. Determination of Tin in Stanniferous Alloys

383

APPENDIX.

SYSTEMATIC ARRANGEMENT OF THE OXIDIZED MINERALS, ACCORDING TO

THEIR BEHAVIOR BEFORE THE BLOWPIPE

BEHAVIOR OF THE URINARY CALCULI BEFORE THE BLOWPIPE:-

...

Page

5. Ammoniacal Phosphate of Magnesia Calculi

6. Calculi composed of the Phosphates of Lime and Magnesia-

393

...

...

::

:

SECTION I.

B