The occurrence of n-heptadecanoic acid (margaric acid) in unhydrogenated mutton fat.

The authors wish to thank the Medical Research Council for a grant from which the expenses of this work were defrayed, E. R. Squibb and Sons for a generous gift of oestrone, Professor R. J. Kellar and Dr Susanne Paterson of the Department of Obstetrics and Gynaecology and Dr A. Klopper of the Clinical Endocrinology Research Unit (M.R.C.) for providing facilities for the collection of urine, and Dr J. W. Minnis for carrying out the microanalyses.