. The Philosophical magazine; a journal of theoretical, experimental and applied physics. its decompositions guanine is closely allied to creatine; forDessaignes found that this body, when oxidized, is resolved intooxalic acid and methyluraminc, C* H N^, which is nothing more than methvlguanidine, C^H^ l-N^. And under other circum- ?•J ....stances Dessaignes found that creatine yields an acid, C^H^N^O*, which appears to be a niethylparabanic acid, judging from a comparison of the properties and of the formulae of the two acids, C2Q2 {,^ct C2 02 !^N2 W) C^HMlJ Parabanic acid. Metlnlparaban
. The Philosophical magazine; a journal of theoretical, experimental and applied physics. its decompositions guanine is closely allied to creatine; forDessaignes found that this body, when oxidized, is resolved intooxalic acid and methyluraminc, C* H N^, which is nothing more than methvlguanidine, C^H^ l-N^. And under other circum- ?•J ....stances Dessaignes found that creatine yields an acid, C^H^N^O*, which appears to be a niethylparabanic acid, judging from a comparison of the properties and of the formulae of the two acids, C2Q2 {,^ct C2 02 !^N2 W) C^HMlJ Parabanic acid. Metlnlparabanic acid. From its decompositions, creatine may be regarded as com-posed of cyanamide and of methylglycocol (sarcosine); and itsrelations to creatinine and guanine are evident from a comparisonof the formulse C* IP 0-^. rcatinc. Creatinine. Guanine. that is, guanine may be regarded as creatinine containing anatom of hydrogen in the place of methyle, and containing besides2 equivs. of cyanogen, in which it is analogous to a number oforganic bases, ?uch as cynniline, eyanoeodcine, &c. Strecker has also investigated several points in reference to theartificial xanthine which he jjrcparcd^^, which prove that it isidentical with the natural product, and not merely isomeric, ashad been suggested. He finds that xanthine is soluble in 570parts of boiling, and in 2120 parts of cold water. From its formula, xanthine may be considered as belongingto an homologous series along with theobromine and caffeine, as ? Phil. Mag. vol. xviii. p. 135. 138 M. Stasis New Determination of the Atomic Weights. their formulse only differ by nC^ H^, CioH^N^O* C*H«N*0i CSHON^O^ Xanthine. Theobromine. Caffeine. Strecker has indeed shown that theobromine may be convertedinto caffeine, to which it bears the same relation as
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