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Evbry stone for grinding tools should ; i be provided witk a rost, and apprentices ; i should be tauglit iiow to use it. New Indication of Death. - A meditad practitioner proposes. as a method to ascertain dcatli, tb mject a drop oi : ammonia beneath tho skin, wben, if there be life, a red spot appears, but if J death, 110 effect is produced. LlGHT AS A MEOHANICAIi MoTOK.- Wm. Crookes.. F. E. S., ha3 recenüy performed several experiments with an apparatus called the "radiometer," which prove tbat liglit, apart frorn lieat, j may be employed as a mecbanical motor. A Paper Substttute fok Leather. - An Australian cliemist subjects tbe i called parcbment paper to a procesa I wliicb renders it pliable and snpple, and ; exactly similar to leatber in color and gloss. It may be iwed as a substitute i for, and is especially appropriate for j book-binding, as it resists wear, does not soil, and is impervious to wet. To Bestoke Gold on Silver Lace. - Wben gold or silver laöe happens to be ' tarnisbed, tbc best liquor tbat can be used for restoring its luster is spirits of wine; it sbould be warmed bef ore it is applied to the tarnisbed spot. This ap! plication ivill preserve the color of the I silk or embroidery. Stamping Ink.- An excellent stamping ink tbat dries rapidly and is free from greaso may be cheaply prepared, according to Maller, by dissolving one pai-t of crystallized, so-called, red amline violet in 30 parts of alcohol, and adding 30 parts of glycerine to tlie solution. This oolored liquid is poured upon the j cushion aud rubbed witli a brush. How to Make Safes Safe.- The j lowing hints for the use of safes, and of j what shotlïd be put in them, are vouohed for by good authority. Avoid fancy colored inks, as they are more liable to be obliterated by heat when the safe is under fïre. The black inks are better. Lead pencil will stand the heat better than either, even when the paper is black. Do not put the most valuable account books at the sides of the safe, as the heat coming from the outside will affect them first. Crowd the books from the sides to the center of the safe for the puipose of making mem tigni logemei, as in this condition tliey will stand tlie I heat much longer. Wood drawers are i preferable to iron for cash boxes, and for small valuablo papera, as wood is a non conductor of heat and iron a good , conductor. Never use in a safe a leather wallet as a receptadle for valnable papers, as boiling water, heated 212 degrees, will orisp and curl it, convert it into a j gluoy eubstance and destroy the papers. When a safe has been under fire send for an expert to open it.