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oxide, melted in a cupola, are mixed together, by Bell, in a revolving puddling furnace, at a moderate temperature, when the phosphorus oxidizes before the carbon has been absorbed. The purified iron is then withdrawn into a furnace, in which it is changed into wrought iron or steel.--Ber. Deu$~eh. Ghem. ~es.
O.
Propagation of Electricity and l~'eat.--Cornu has investigated the application of Fourier's formulm relative to the diffusion of heat to the propagation of electricity. I-Ie finds that there are, under certain conditions~ phenomena which may be represented as electric waves moving with a constant velocity, but that there is another phenomenon, which he calls the diffusion of electric waves, which seems to vary with the simple distance rather than with the square of the distance.wCompte8 l:lendu~.
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## Gum Arabic Solution.--The adhesiveness and durabill V of u solution of 100 parts gum arable in 250 parts water may be increased by adding 2 parts of sulphate of alumina.--Polytech. Notlzbl. C. Artificial Quartz Crystals.--M~l. Friedel and Sarrazim have obtained quartz crystals by the aetlon o