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Synopsis This concise book has the ambitious goal of presenting the present status of the problem of vitamins as related to plants. Only about twelve years ago a botanist interested in these problems was considered unique. Despite the fundamental research on vitamins since the beginning of the present century the problem has not yet reached maturity. During the past few years extraordinary progress in the study of vitamins has taken place in fact, it has completely changed the status of problem. The enormous number of publications justify this critical review. It does not by any means represent finality, but rather a stage of progress in research which continues to advance. Its purpose is to crystallize our knowledge in this domain, to show the relations of this subject to very diverse sciences, and above all, to point out and prepare the course to be followed. The bibliography in this book are not completed; only the references pertinent to the reader's orientation are given.