Metal. Globule. Incrustation. Gold. Yellow, malleable. None. Silver. White, malleable. None. Copper. Red, malleable. None. Lead. White, malleable. Red when hot, yellow when cold. Bismuth. White, brittle. Red when hot, yellow when cold. Zinc. None. Yellow when hot, white when cold. Antimony. White, brittle, fumes. White. A small loop is made at the end of the platinum wire, and it is heated and dipped in borax; heated again, then touched while hot to the powdered mineral and heated once more. The following colors are obtained: COLOR OF BEAD. O.F. R.F. Metal. Red or yellow, hot. Bottle-green. Iron. Yellow or colorless, cold. Blue, hot or cold. Blue. Cobalt. Green, hot; blue, cold. Red. Copper. Amethyst. Colorless. Manganese. Green. Green. Chromium. Violet, hot; red-brown, cold. Gray. Nickel. The substance to be tested is generally powdered and moistened, placed in the cavity and covered or not as circumstances may demand, with a pinch of carbonate of soda or other suitable reagent. The following results may be obtained: Antimony. Place the mineral in the cavity with a little of carbonate of soda, and blow upon it with the inner or oxidizing flame. This is formed by inserting the blow-pipe an eighth of an inch into the flame and blowing steadily. A white incrustation on the coal, and a brittle button of antimony should be the result. Lead. Treat the suspected lead ore the same way, and you will get a yellow incrustation on the coal and a button of malleable lead. Zinc. Proceed as above, and after blowing for a few seconds moisten the incrustation with a drop of nitrate of cobalt. Heat once more, but this time use the outer or reducing flame, which is produced by keeping the point of the blow-pipe a little outside the flame and blowing more gently than before, so that the whole flame playing upon the coal may be yellow in color. A green incrustation will be an evidence of zinc. Copper. As usual, mix the ore and the soda into a paste and fuse it with the oxidizing flame. Dig the mass out of the charcoal with the point of a knife and rub it in the mortar with water. Now decant into a test tube, and, allowing the sediment to settle, pour off the water. If there was copper in the ore, red scales will be found in the test tube. Arsenic. Heat in the inner flame for a second or two, and if the ore contains arsenic you will notice an odor of garlic.