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 Na_{2}CO_{3}. Instantly reduced. Coats the Ch. upon further blowing. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{2}____ 11. ~Manganese, Mn_{2}O_{3}.~--Before the Bp. on Ch. At high temperature turns red. Before the Bp. on Ch. with Na_{2}CO_{3}. Is not reduced. Before the Bp. in O. F. on platinum foil with Na_{2}CO_{3}. Transparent green mass when hot. Opaque, bluish-green when cold. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{2}____ 12. ~Mercury, HgO.~--Before the Bp. on Ch. Instantly reduced. Very volatile. Before the Bp. on Ch. with Na_{2}CO_{3}. Reduced and volatilized. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{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 Na_{2}CO_{3}. Easily reduced to the metal. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{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 Na_{2}CO_{3}. Instantly reduced to metallic globule. In ignition tube with Na_{2}CO_{3} 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(NO_{3})_{2}____ 15. ~Tin, SnO_{2}.~--Before the Bp. on Ch. Coats the coal yellow while hot, dirty white when cool. Not reduced. Before the Bp. on Ch. with Na_{2}CO_{3}. Reduced to metallic tin. White, hard, malleable bead. Coating white and close to assay. 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 limpid glass. With Co(NO_{3})_{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 Na_{2}CO_{3}. Reduced to metal. Rapidly volatilized, coating the coal white. In ignition tube with Na_{2}CO_{3} and Ch.____ In flame on platinum wire____ With borax bead on platinum wire. In O. F. yellow while hot, limpid glass when cold. With Co(NO_{3})_{2}. Green mass.