By Margaret Lowenfeld

A previous investigation gave the variations in the chemical composition of normal human colostrum and early milk (Lowenfeld, Widdows, Bond and Taylor, 1927). This work has now been extended to a study of the composition of milk secreted after the first month lactation with the view not only of comparing the relative quantities of the constituents at the different stages of lactation, but also of comparing the relative quantities of these substances at the same stage of lactation. The material for this work has been obtained from the children’s department of the Royal Free Hospital, Shoreditch Carnegie Welfare Settlement and from the Mothercraft Training Society, Cromwell House, Highgate.