I954 alcohols has been established. Some saturated sterol (probably ,-cholestanol) is present and a number of other sterol or sterol-like substances which form insoluble digitonides have been found. The author wishes to thank Dr R. M. B. MacKenna and Professor A. Wormall for their interest and help. The two specimens of ovarian dermoid cyst lipid were kindly supplied by Dr Magnus Haines of the Chelsea Hospital for Women, the ear wax and vernix caseosa specimens by the Ear, Nose and Throat and Maternity departments of St Bartholomew's Hospital, and the epidermal cyst by Dr I. S. Hodgson-Jones.

THE study of the formation and utilisation of fat in the fowl is of fundamental interest, since our knowledge of these processes in the bird is very meagre, investigations of fat metabolism having been so far carried out almost exclusively on mammals. With a view to eliciting information along these lines it was decided to investigate two problems which presented themselves as being of primary importance to the poultry industry. (1) The approximate composition of the mixed fatty acids of the normal egg and the extent to which this may be modified by the inclusion of fat in the ration. (2) The influence of ingested fat on the composition of the depot fat. The latter investigation is of a preliminary nature.In the following paper the two problems outlined will be dealt with in separate sections.

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