€544. A Convenient Solid for Calibration of the Gouy MagneticSusceptibility Apparatus. By B. N. FIGGIS and R. S. NYHOLM. THE measurement of magnetic susceptibilities by the Gouy method is a relative one, the apparatus being calibrated in terms of a substance of known susceptibility, for which water, nickel chloride solution, and powdered cupric sulphate pentahydrate or ferrous ammonium sulphate hexahydrate have been used. The low suceptibility of water is often inconvenient if small tubes are being calibrated. Nickel chloride solution requires accurate analysis before use and ferrous ammonium sulphate is often of questionable purity. This substance and copper sulphate do not pack well and several different values for the susceptibilities of both solids have been reported.The required properties for a calibrant are: (1) Readily available pure;(2) an accurately known and moderate susceptibility (xg = ;(3) stability in moist air;(4) xg must vary in a known and simple way, at least at room temperature; (5) easily and reproducibly packable into the Gouy tube. The complex mercury tetrathiocyanatocobaltate HgCo(CNS), offers some advantages and its susceptibility has therefore been accurately determined. at 20' 1 being used as reference, the gram susceptibility of the complex is 16.44 (-&O.OS) x at 20".As reported elsewhere,l it obeys the Curie-Weiss law, xg cc (T + lO)-l where T is expressed

The oligosaccharide fraction obtained by hydrolysis of phytoglycolipid from corn has been separated on Dowex-2 (HC03 ~) into a series of oligosaccharides of progressively increasing molecular weight. The first number of the series is the trisaccharide, glucosaminido-glucuronido-inositol. This trisaccharide is obtained by mild acid hydrolysis of all the higher oligosaccharides and accounts essentially quantitatively for their glucosamine and glucuronic acid content. The tetrasaccharide fraction was characterized by preparation of crystalline derivatives and was shown to contain only mannose (in addition to trisaccharide). The higher oligosaccharide fractions contained, in addition, varying amounts of galactose, arabinose, and fucose.The penta-, hexa-, hepta-, and octasaccharide fractions were in each case mixtures from which no single constituent was separated.In previous publications (Carter et al., 1958b(Carter et al., , 1962(Carter et al., , 1964 evidence has been presented for the following partial structure for phytoglycolipid, a complex glycolipid found in corn, soybean, flax, and other seeds.

Betts and Davey. 3333 651. Cyclohexane-1,3-diones. Part VI.l Structural Requirements for the Displacement of the Alkoxyl by the Cyano-group in the En01 Ethers of Cyclic p-Diketones.

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