Before the Bp. on Ch. with Na_{2}CO_{3}. Reduced with emission of arsenical fumes. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{2}.____ 4. ~Bismuth, Bi_{2}O_{3}.~--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 Na_{2}CO_{3}. Easily reduced to metallic bismuth. Yellow bead brittle, but less so than antimony. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{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 Na_{2}CO_{3}. Readily reduced. The metal volatilizes easily, giving the characteristic coating. In ignition tube with Na_{2}CO_{3} and Ch.____ In flame on platinum wire____ With borax bead. In O. F. dissolves to a clear yellowish bead, colorless when cold. With Co(NO_{3})_{2}____ 6. ~Chromium, Cr_{2}O_{3}.~--Before the Bp. on Ch. No change. Before the Bp. on Ch. with Na_{2}CO_{3}. Cannot be reduced. Soda sinks in Ch. and a green colored mass remains. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{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 Na_{2}CO_{3}. Reduced to a gray magnetic mass. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{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 Na_{2}CO_{3}. Readily reduced to metallic bead, which is red in color, hard, malleable. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{2}____ 9. ~Iron, Fe_{2}O_{3}.~--Before the Bp. on Ch. In O. F. unchanged. In R. F. becomes black and magnetic. Before the Bp. on Ch. with Na_{2}CO_{3} Reduced to a metallic powder, magnetic. In ignition tube with Na_{2}CO_{3} and Ch.____ In flame on platinum wire____ With borax bead on platinum wire. In O. F. red while hot, yellow when cold. With Co(NO_{3})_{2}____