ALREADY several kinds of oxides of the saturated series have been examined in reference to their magnetic rotation, uamely, ethyl a n d isoamyl ethers, acetic and propionic acids, and pyro tartaric anhydride. The results these have given, when compared with those obtained from their hydroxylic representatives, are fairly comparable, as will be * Dobbie and Lauder, Trans., 1892,244 and 605. t Freund and Josephy, Ber., 25, 2412. THE COMPOSITION OF COMMERCIAL ACONITINE. 491 fore, in this respect,

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... orrespond to glycol and ethylene oxide (Trans., 1888, 53, 597) ; but from the boiling poiuts of these unsaturated compounds and other properties (Trans., 1888, 5 3, 710), they appear to possess peculiarities of their own which are not clear at present, and render them unsuitable for comparison with saturated compounds.