Eccles and Palmer (9) have conducted a very thorough experimental study of the influence on milk production of the under-feeding of cows. They have examined the composition of milk produced by cows whose rations were, from a qualitative standpoint, suitable biologically, but inadequate in amount. Their results show that cows were able, during the early part of the lactation period, to maintain the milk flow undiminished for forty days, during which they received but 75 per cent of the quantity of food sufficient for their requirements. Under such conditions of nutrition there were no pronounced changes in the composition of the milk. During the latter part of the lactation period there was, however, as the result of underfeeding, some falling off in milk secretion.