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150°and 145-147°, respectively. In ether these iodides decompose slowly with the liberation of iodine.Optical Properties.-Indium trimethylsulfonium chloride crystallized in such irregularly twinned monoclinic prisms that the refractive indices could not be determined. Indium trimethyl sulfonium iodide yielded anisotropic crystals whose indices of refraction were greater than that of methylene iodide. Indium triethylsulfonium iodide gave such extremely minute crystals that the optical properties could not be determined.

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List of literature.. 574 This paper is the outcome of some experiments carried out mainly during the months of last autumn. T h e problem was suggested to me by Prof. T. H. Morgan, under whose direction this work has been done, and it gives me great pleasure to avail myself of this opportunity to express my sincerest gratitude to Prof. T. H. Morgan for having awakened in me an active interest in the subject, and also for his kindness in revising the manuscript. 'Prof. C. 0. Whitman: Animal Behavior. Biol. Lectures. 4 0. Diffenhach: .Anatomische und systematische Studien au Oligochaetae limicolz. Von N'urmern des sussen und salzigcn Wassers, Kopenhagen, 1771.

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