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Dr. Tilden has drawn my attention to an interesting example of the lowering of melting-point by the mixture of salts. The melting-point of monohydrochloride of turpentine oil is 125°, while that of the dihydrochloride is 50°; but on simply stirring together these compounds in a mortar at common temperatures, they immediately liquefy.
Two molecules of the monohydrochloride and one molecule of the dihydrochloride form a mixture which melts at about 20°. Although many fusible alloys have been long known, I believe no true eutectic metallic alloy had been studied until Dr. Guthrie worked at the subject, employing the same methods as with his cryohydrates.
The second of these objects has been achieved by the researches of Ehrlich, who, in conjunction with his pupil, Hata, has built up a compound, the dihydrochloride of dioxydiamido-arseno-benzol, popularly known as salvarsan or "606." Other preparations, such as kharsivan, arseno-billon, and diarsenol, are chemically equivalent to salvarsan, containing from 27 to 31
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