WE make a distinction between preparative and the usual counter-current distribution. By the latter we mean, of course, the very efficient method of separation based on extraction, devised chiefly by ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Lyman C. Craig (1906-1974) was a ...

THE increasing use of counter-current distribution between solvents, in machines of the kind developed by Craig 1, for the purification of natural products prompts us to direct attention to simple ...