imparted to flame.

Before the Bp. on Ch. with Na₂CO₃. Readily reduced. White brittle bead. Very volatile, giving characteristic white coating.

In ignition tube with Na₂CO₃ and Ch. Volatilized.

In flame on platinum wire. Volatilized. Colors flame greenish blue.

With borax bead on platinum wire. In O. F. dissolves to a colorless glass.

With Co(NO₃)₂.____

3. Arsenic, As₂O₃.—Before the Bp. on Ch. Very volatile. Strong garlic odor to fumes.

Before the Bp. on Ch. with Na₂CO₃. Reduced with emission of arsenical fumes.

In ignition tube with Na₂CO₃ and Ch. Volatilizes, forming a mirror-like deposit of metallic As in the cooler part of tube.

In flame on platinum wire____

With borax bead on platinum wire____

With Co(NO₃)₂.____

4. Bismuth, Bi₂O₃.—Before the Bp. on Ch. Yields a coating—orange-yellow when hot, lemon-yellow when cold. The yellow coating usually has a white outline.

Before the Bp. on Ch. with Na₂CO₃. Easily reduced to metallic bismuth. Yellow bead brittle, but less so than antimony.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead on platinum wire. In O. F. small quantity dissolves to a clear yellow glass, which becomes colorless when cold.

With Co(NO₃)₂____

5. Cadmium, CdO.—Before the Bp. on Ch. Gives a coating on the coal. Reddish-brown when cold. Very volatile.

Before the Bp. on Ch. with Na₂CO₃. Readily reduced. The metal volatilizes easily, giving the characteristic coating.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead. In O. F. dissolves to a clear yellowish bead, colorless when cold.

With Co(NO₃)₂____

6. Chromium, Cr₂O₃.—Before the Bp. on Ch. No change.

Before the Bp. on Ch. with Na₂CO₃. Cannot be reduced. Soda sinks in Ch. and a green colored mass remains.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead. Dissolves slowly but colors intensely. Yellow while hot, green when cold.

With microcosmic salt bead. Colors red when hot, green when cold.

With Co(NO₃)₂____

7. Cobalt, CoO.—Before the Bp. on Ch. In O. F. unchanged. In R. F. is reduced to the metal and is magnetic.

Before the Bp. on Ch. with Na₂CO₃. Reduced to a gray magnetic mass.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead on platinum wire. In O. F. colors very intensely blue, both hot and cold.

With Co(NO₃)₂____

8. Copper, CuO.—Before the Bp. on Ch. Fuses to a black globule, which can be reduced with some difficulty.

Before the Bp. on Ch. with Na₂CO₃. Readily reduced to metallic bead, which is red in color, hard, malleable.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire. Colors flame emerald-green.

With borax bead on platinum wire. In O. F. green when hot, blue when cold.

With Co(NO₃)₂____

9. Iron, Fe₂O₃.—Before the Bp. on Ch. In O. F. unchanged. In R. F. becomes black and magnetic.

Before the Bp. on Ch. with Na₂CO₃ Reduced to a metallic powder, magnetic.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead on platinum wire. In O. F. red while hot, yellow when cold.

With Co(NO₃)₂____

10. Lead, PbO.—Before the Bp. on Ch. Easily reduced to the metal, bead very malleable. Coating yellow, surrounded by white ring.

Before the Bp. on Ch. with Na₂CO₃. Instantly reduced. Coats the Ch. upon further blowing.

In ignition tube with Na₂CO₃ and Ch. Reduced to the metal.

In flame on platinum wire. Tinges flame blue.

With borax bead on platinum wire. In O. F. dissolves easily, forming a limpid glass.

With Co(NO₃)₂____

11. Manganese, Mn₂O₃.—Before the Bp. on Ch. At high temperature turns red.

Before the Bp. on Ch. with Na₂CO₃. Is not reduced.

Before the Bp. in O. F. on platinum foil with Na₂CO₃. Transparent green mass when hot. Opaque, bluish-green when cold.

In ignition tube with Na₂CO₃ and Ch. Not reduced.

In flame on platinum wire____

With borax bead on platinum wire. In O. F. violet-red while hot, amethyst-red when cold.

With Co(NO₃)₂____

12. Mercury, HgO.—Before the Bp. on Ch. Instantly reduced. Very volatile.

Before the Bp. on Ch. with Na₂CO₃. Reduced and volatilized.

In ignition tube with Na₂CO₃ and Ch. Sublimes condensing in the upper part of the tube as a metallic ring which is seen with the lens to consist of minute globules of mercury.

In flame on platinum wire____

With borax bead on platinum wire____

With Co(NO₃)₂____

13. Nickel, NiO.—Before the Bp. on Ch. In O. F. unchanged. In R. F. reduced to metal, slightly magnetic.

Before the Bp. on Ch. with Na₂CO₃. Easily reduced to the metal.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead on platinum wire. In O. F. violet while hot, reddish-brown when cold.

With Co(NO₃)₂____

14. Silver, AgO.—Before the Bp. on Ch. Easily reduced to the metal. White, malleable, hard bead. Coats the coal dark red near assay.

Before the Bp. on Ch. with Na₂CO₃. Instantly reduced to metallic globule.

In ignition tube with Na₂CO₃ and Ch. Reduced to the metal.

In flame on platinum wire____

With borax bead on platinum wire. In O. F. partially dissolved. Bead becomes milk-white.

With Co(NO₃)₂____

15. Tin, SnO₂.—Before the Bp. on Ch. Coats the coal yellow while hot, dirty white when cool. Not reduced.

Before the Bp. on Ch. with Na₂CO₃. Reduced to metallic tin. White, hard, malleable bead. Coating white and close to assay.

In ignition tube with Na₂CO₃ and Ch.____

In flame on platinum wire____

With borax bead on platinum wire. In O. F. small quantity dissolves to limpid glass.

With Co(NO₃)₂. Greenish-blue color.

16. Zinc, ZnO.—Before the Bp. on Ch. Upon ignition becomes yellow. Is not reduced.

Before the Bp. on Ch. with Na₂CO₃. Reduced to metal. Rapidly volatilized, coating the coal white.

In ignition tube with