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The production of the second edition of the second volume of what has become established as a most useful text will be welcomed by students and research workers alike. The small criticisms made of the presentation of the first edition have largely been met in the standards of the materials, and the hard covers should avoid the problems of the first edition copies which tended to wear out (itself a compliment to the usefulness of the book). Once again the use of very clear diagrams and good photographs aid the clarity of the text enormously.The material presented in the first edition has been considerably expanded. A number of chapters have been split to allow for wider coverage. For instance, the chapter entitled "The requirements for lipids, carbohydrates and vitamins; development of purified diets" has been divided into the separate topics. The coverage of the book is very wide; from the often ignored topic of …