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Langstein has prepared this manual as a guide book for the practicing physician. Under the heading of "dystrophies" he considers the chronic nutritional disturbances of young infants. In a brief and practical way he outlines the causes of failure of infants to thrive, and describes in considerable detail the treatment of difficult feeding cases of various types. He advises no complicated formulas, but relies on breast milk, buttermilk containing about 1.5 per cent fat, and simple dilutions of whole milk with added sugar. For very atrophic infants he recommends the addition of casein to breast milk, and mixtures of breast milk and buttermilk. The importance of treatment of the underlying causes of atrophy is emphasized. He repeatedly warns against overfeeding. The author feels that the feeding of high fat has no more effect in increasing the immunity than high carbohydrate. No mention is made of blood transfusions as a therapeutic