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The call for a reprint of this volume within seven months of its publication must be most gratifying to the Editors and their collaborators, and is ample proof that it has filled a gap in medical literature. Although the work suffers, like all such compilations in which many authors take part, from a certain degree of overlapping and from a varying degree of thoroughness with which the different subjects are treated, and although, in spite of its claims, it does not appear to us to be any more rationalistic or decisive in its recommendations than the average text-book on medicine, it can be recommended as a reliable guide to present-day therapeutics in certain groups of diseased conditions. THE CHEMICAL COMPOSITIONOF FOODS.

Extracteaten by a younger well nourished child or animal of the same size, b i t i t may-be more (see below). The rate of catch-up There is a critical point in development when the size of an growth varies with the energy value of the food consumed, and animal, arising from its previous plane of nutrition, determines the food is converted to new tissue in the normal way 9, its appetite thereafter, and hence its rate of growth and ,,,dmensions at maturity. A small size at this critical time, The expenmental work both on rats and pigs has brought undernutrition, is not ''catchout a further fact about catch-up growth. It is only complete if up" growth, however liberal the diet.A full diet produces catch-up growth only if the undernutrithe period of undernutrition has been relatively brief (31). Furthermore, it becomes less and less complete as the period tion, whatever its cause, has occurred after this critical period of undernutrition is prolonged (13,14), and this has been is over. It can, moreover, only restore a young animal to its percentile channel of growth. and its ability to do this after attributed to the progressive effect of age.iong periods of undernutrition becomes progesssively limited by the animals chronologic age when the catch-up growth became possible.

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