By Valentine Edward Johnson

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A o 45 46 CHEMISTRY AND CHEMICAL MAGIC . being very liable to explode. The composition should not be kept for any length of time before using, as is liable to spontaneous combustion. EXPERIMENT 3 6 Burning Water Apparatus. A brass bowl, a clear glass decanter and a tumbler. Chemicals. Ether (pure). Potassium (the metal). In the decanter is clean water, which may be poured into the tumbler and drunk. On pouring this same water into the bowl (of brass or iron) it at once catches fire and burns, producing a flame a foot or so in height.

N O T E S ON C H A P T E R IV Phosphide of calcium is obtained by heating together lime and phos Miorus in a closed crucible. In Experiment 40 a solution of caustic soda and coal-gas can be used instead of potash and ether, the coal-gas previous to heatingVbeing made to displace the air in the flask. Phosphuretted hydrogen has an poisonous, amd must not be inhaled. unpleasant odour, is If a jar of\oxygen be held over the neck of the retort described in Experiment 40, a bright flash of light and an explosion occur\; and if the experiment be performed in a darkened room tiie effect is similar to that of a sudden flash of lightning.

N o w take the print and float it on a 5 per cent, bath of chloride of mercury. The image rapidly fades and finally disappears altogether. Thoroughly wash in water and allow to dry. The latent image can be caused to reappear by immersing the print in a 5 per cent, solution of h y p o ; or a weak solution of ammonia might be tried, it having the property of colouring black the chloride of mercury. % EXPERIMENT The Magical 19 Drawing It is a well-known scientific fact that the vapours of mercury are very diffuse in their action, /^'IfPf - '—^fHa and palladium being _ Am strongly affe&ted by £jf mercurial vapours.

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