Show oJ J Summer Vs Winter Summer butter contains a n growth promotion on substance which is Js distinct dis dis- distinct from the known soluble fat vitamins and the essential fatty acids and which apparently Is not found In winter butter The new factor factor factor fac fac- tor has been identified as being vac vac- enie acid an isomer of ot oleic lele acid acid is at least partially destroyed by hydrogenation but is relatively stable to heat Apparently Apparently Apparently still another unidentified nutrIent nutrient nu nu- nu- nu trient intent is present in the non-fat non part of butter |