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ir''A -_--' F 0 E T R. TT.I



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CF.MENT.—The following receipt for a cement is civen in one of the scientific journals of France. Steep an ounce of isinglass for twenty-four hours in half a pillt of spirits of wine, thell dissolve it over a slow fire, keeping it covered, that it may not evapo- rate; then take six cloves of garlic, previously pounded in a mortar, and squeeze the juice through liueu into the isinglass cork the whole together for a short time, and the mixture will cement either glass or crystal. DIAMOND.—The diamond is pure carbon, or charcoal crystallized. 11 is among the rarest of all known substances, and carbon is among the most abundant. We can have a roomful of pure carbon tor sixpence, but a bit of pure crystal iized carbon the size of your thumb is worth many thousand pounds. You drink diamonds when you drink soda- water; hut you drink them in the form ot gas. Mr Faraday has succeeded by immense pressure, in reducing carbon frolll the gaeous to the liquid state; but it must he kept in a glass tube, hermeti- cally scaled. The moment it conies in contact with ibe alf11ophere, it aain assumes the gaseous form, Diamond require great heat to burn it; but when it does bum, it cousurues utlerly. lis whole substance changes iuto that kind of gas which is pumped into soda-water, and is produced natupally in champagne. SINGI/LAR DISCOVERY—ARSENIC IN CANDLES. —At the meeting of the Medico-Botanical Society, Earl Stanhope in the chair, Mr Everitt.the professor of chyiuistry, made some remarks respecting the tests for arsenic and afterwards demonstrated its presence iu the composition candles. Having- fully proved the existence of the poison in the candle, in the propor- tion of at leallt two grains ill each (aud he stated his belief that fourgraills were a morecorrect statement,) he then proceeded to assign a reason for its use. Candles which are made of tallow have too low a melting point to admit of the use of a curved wick. Steriue or spermaceti, either of which has a much higher melting point, is therefore employed iu making the composition candles, and to prevent its running iato grain or crystallizing, a certain quantity of wax was added, which it was found would fully answer the purpose. It waj, afterwards discovered that IS small quantity of arsenic would effect the same object, and, it being considerably cheaper, it was adopted into use. The Professor further stated, that when he had made the discovery, and it had become bruited abroad, his opinions were confirmed by two or three manufacturers.who acknowledged using the poison. He left it to the members of tbe profession to determine whether arsenic thus volatilized, and coming in contact with the lungs, would prove deleterious. Judging t'"°™ lhe eficcu of other gases, be thought it would be injuiious.


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