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10-Thiocyanomethyl-1,2-benzanthracene; -, 9-thiocyano-10-methyl-l,2-benzanthracene.1.2-benzanthracene and 1,2-benzanthracene indicates that in spite of the considerable chemical reactivity and unsaturation of the thiocyano group,

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Several of the polysaccharide constituents of yeast, including glycogen, yeast gum, and several water insoluble compounds, have been described by a number of investigators.1-8 The chemical structure of one of these constituents, mannan, was studied in detail by Haworth, Hirst and Isherwood.8 These authors showed that the yeast mannan differs fundamentally in structure from the mannan of the ivory-nut9 and that synthesized from glucose by Penicillium Charlesii G.Smith. Zechmeister and Toth4 studied the insoluble yeast polysaccharide which was first described by Salkowski3 and referred to as ''yeast cellulose." They found that although this diffi-