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eft on the surface. Laid on silver, the fused mass gives a sulphur reaction. (4) in forceps. Fuses easily to a clear glass, coloring the flame yellow. (5) in borax. Fuses easily and gives the lime reaction. (6) in mic. salt. As in borax. (7) with carb. soda. As alone in charcoal. (8) Special reactions. As in preceding. * * * * * Mineral. Borax Formula. [.Na][...B]^{2}+10[.H]. Behavior (1) in glass-bulb. Intumesces with the evolution of water, and under a strong heat fuses. (2) in open tube. -- (3) on charcoal. Intumesces and fuses to a clear bead more or less colored by impurities. (4) in forceps. As on charcoal. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. Fuses to a clear bead, which becomes crystalline on cooling. (8) Special reactions. Gives the boracic-acid-reaction. * * * * * Mineral. Cryolite Formula. 3NaFl+Al^{2}Fl^{3}. Behavior (1) in glass-bulb. Decrepitates slightly and gives a trace of water. (2) in open tube. If heated so that the flame be allowed to play up the tube upon the mineral, flourine is evolved, which corrodes the interior of the tube. (3) on charcoal. Fuses to a limpid bead, which on cooling becomes a white enamel. If heated for some time, it bubbles, gives off fluorine and becomes infusible. (4) in forceps. Fuses, coloring the flame yellow. (5) in borax. Dissolves to a clear bead, which is rendered opaque by a large addition. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses to a clear bead, then spreads out on the charcoal, the soda is absorbed, and an infusible mass of alumina remains. (8) Special reactions. If the alumina residue obtained be moistened with cobalt solution and heated strongly, it assum
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