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New Theory of Gases.
Utflmatien of Cindera and Coal Refuse. --Noack Dollfus :has prepared a valuable paper upon the preparation of beton from slag ~and other refuse, by the addition of about 20 per cent. of lime. By using the methods and precautions which he points out, foundation walls and superstructures of great strength and durability can be made.
๐ SIMILAR VOLUMES
Melting Steel by Eleetrieity.--Dumas recently exhibited to the French Academy an ingot of steel, which Siemens had melted by an electric current in a crucible of magnesia at the Palais de l'Industrie, !n the British section of the Exposition. The fusion was completed in 14 minutes, requiring for the
Zo~tle'8 .Equiv(dent. ## 177 (2) With heavy tensions a double belt will drive more than a single one.
On applying Quantum Mechanics to the problem of a particle bound in an external gravitational potential, we find the following results, which violate one's classical conception of the principle of weak equivalence: radii, frequencies, etc., depend on the mass of the bound particle; the binding energ