(3) on charcoal. Gives off fumes smelling strongly of selenium and coloring the flame blue. In the reducing flame fuses partially and incrusts the charcoal with Se and PbO. After some time a black infusible mass alone remains. (4) in forceps. -- (5) in borax. The infusible residue obtained upon charcoal gives an iron and sometimes copper and cobalt reaction. (6) in mic. salt. As in borax. (7) with carb. soda. With carbonate of soda, oxalate of potash yields a metallic bead, the fused alkali laid upon silver and moistened produces a stain similar to that produced by sulfur. (8) Special reactions. -- * * * * * Mineral. Jamesonite Formula. [,Pb]^{3}[,,,Sb]^{2}. Behavior (1) in glass-bulb. Fuses and gives off some sulphur, sulphide of antimony and antimony which condense in the neck of the bulb. (2) in open tube. Fuses and emits dense white fumes of SbO^{3}, which pass off and redden blue litmus paper. (3) on charcoal. Fuses with great ease evolving much SbO^{3} and PbO, which incrusts the charcoal around the mineral. When the fumes have ceased, a small bead of metallic lead remains. (4) in forceps. -- (5) in borax. The yellow incrustation formed upon charcoal gives the reaction of lead, and the white those of antimony. (6) in mic. salt. As in borax. (7) with carb. soda. As alone on charcoal. The fused alkali gives the sulphur reaction on silver. (8) Special reactions. -- * * * * * Mineral. Minium Formula. Pb^{3}O^{4}. Behavior (1) in glass-bulb. -- (2) in open tube. -- (3) on charcoal. Is reduced first to litharge (PbO) and then to metallic lead which forms the usual incrustation. (4) in forceps. Colors the outer flame blue. (5) in borax. Gives the lead reactions. (6) in mic. salt. As in borax. (7) with carb. soda. As alone on charcoal. (8) Special reactions. -- * * * * * Mineral. Mendipite Formula. PbCl + 2PbO. Behavior (1) in glass-bulb. Decrepitates slightly and assumes a yellow color. (2) in open tube. --