A Diamond Test
Soiiie time ago we copied from La Nature a picture representing a design drawnon glassby apeucil of aluminium. C. Margot now points ont the fact that if the aluminium is dissolved away by an acid the drawing is still quite visible, with every appearance of an etching. He holds that true chemical uuiou occurs between the aluminium and the glass. He ha found that quartz, einerald, topazand other hard crystals can be etched in the same manner, but the diamond is unaffected. This gives a new test íor a gou nm e diamond.
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Ann Arbor Argus
Old News