No abstract

perature for several days 3.8 g. of crude crystalline material was deposited. This was chromatographed on a Florisil column using benzene as solvent. The benzene eluates gave 1.4 g. of a monohydroxy sapogenin. This material (0.2 g.) was refluxed for 30 min. in 5 ml. of acetic anhydride in pyridine (1:1). The solution was evaporated to dryness in vacuo and the residue recrystallized from methyl alcohol to give needles, m.p. 194-197°. These crystals were identified as yamogenin acetate by comparison of its infrared spectra with that of an authentic specimen. Elution with benzenechloroform (1:1) and chloroform gave 1.8 g. of chiapagenin which, after recrystallization from methvl alcohol, melted at 249-251°, [a] 2D*°-126°.

A major constituent of Lesquerella lasiocarpa seed oil is characterized as (+)-14-hydroxy-cz's-l 1-eicosenoic acid. For convenience, it is called lesquerolic acid.

ConclusionIt was not the object of the foregoing discussion to provide a critical review of rumen physiology or bovine metabolism. Rather, information was selected which, in the judgment of the author, reflects the trends in the field. Unpublished data and speculation were included. The major purpose was to point out the dependence of bovine milk secretion on rumen activity, and to stress that the evaluation of any feeding regime must consider the reactions which occur in the rumen.Future progress in this area depends on gaining more fundamental information on the metabolism of the rumen microorganisms, the metabolism ofthe animal organism, and the interrelation of the two.for potential industrial raw materials from plants not now under cultivation is under way by the U. S. Department of Agriculture (72). This paper reports the first phase of a survey of seeds for their content of water-soluble polysaccharides. Aside from guar and seaweed products, no industrial mucilages of consequence are produced from domestic plants. Guar gum, from the seed of 1 Deceased.

No abstract