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The book is a collection of observations based partially on the author's own experience during the war in the Middle East and among European prisoners of war camps. In addition to thorough clinical observations on deficiency diseases, it contains an excellent review of the literature. The literature is often considered to such an extent that it obscures the personal opinion of the author. At times greater clarity in selection from the abundance of facts and physiologic data could be desired. Summaries at the end of each chapter would help to make the study of this book easier; but that is a minor point, which does not detract from the value of the book. The study is a great contribution to the field of nutritional disorders of the nervous system.