. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. de-cantation, and finally on the filter, until a drop onpolished platinum shows no residue. After dryingthe precipitate remove it to a piece of glazed paper;cover with a bell-glass. Then incinerate the filtertill the carbon has entirely disappeared, add it tothe precipitate already obtained, place all in a cru-cible, cover it and expose to heat to redness, and,finally, if desired, reduce the oxides to the metalliccondition by ignition under a stream of hydrogen. 12. As this p
. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. de-cantation, and finally on the filter, until a drop onpolished platinum shows no residue. After dryingthe precipitate remove it to a piece of glazed paper;cover with a bell-glass. Then incinerate the filtertill the carbon has entirely disappeared, add it tothe precipitate already obtained, place all in a cru-cible, cover it and expose to heat to redness, and,finally, if desired, reduce the oxides to the metalliccondition by ignition under a stream of hydrogen. 12. As this process of reduction to metal is some- MERCURY, BISMUTH, NICKEL, ETC. 213 times very useful, we give a sample plan of appa-ratus for this purpose. Get a half-pint wide-mouthed pickle bottle and introduce two glass tubesof a quarter-inch diameter into a cork fitting themouth, after having nicely adjusted the cork to themouth of the bottle. The tubes may be easily bentand blown as in A B, Fig. 60, over the flameof an alcohol lamp, before permanently fasteningthem in place. To blow a funnel end, heat the end Fig. of the tube to softness and mash it together, her-metically seal, then reheat rapidly, roll it betweenfinger and thumb while gently blowing at the otherend until swollen large enough, then, with pincers,break it or chip it off; if enlarged twice or threetimes the diameter, it is large enough for the pur-pose. The tubes intended to be bent should berapidly rotated in the enlarged flame until red-hot,and then bent to the right angle and graduallycooled. 214 It is well to make another of these bottles for dry-ing the hydrogen, as in B. Introduce the tube asshown in the figure, wherein B represents the dryingbottle in which is placed a quantity of fragmentsof chloride of calcium of the size of peas or evensmaller. In putting the cork with tubes into thisbottle, the bottle should be on its side and rolledwhile introducing the longer tube into the calciumchloride, so that t
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