riments with the substance and measur-ing its radio-active force will be found inScientific American Supplements 1475,1476, 1477. These Scientific American Supplementscomprise what may well be considered an admir-able text-book on the subject of radio-activity. Price of Scientific American… … DixonsPencil Guide A book indexing various voca-tions and giving list of pencilsbest suited to each—is valuable In-formation for pencil users—free. Saves Pencil Troubles . Write for one to-day—keep it bandyfor reference. Department WJoseph Dixon Crucible Co.Jersey City, N. J. BURNS AIR mon£I 99
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