THE AUTHORS PREFACE Some books have been written on Clover in the United States, and as far as they go they serve a good purpose. Many references and discussions have also appeared in various bulletins and reports issued by the experiment stations. These have proved helpful not only in the States in which they have been issued, but also in other States where the conditions are similar. But no book or bulletin has yet appeared which discusses the growth of clovers as applicable to all parts of the United States and Canada. Nor has any been issued which takes up the subject in orderly and consecutive sequence. It is evident, therefore, that there is not only room for a book which will cover the ground with at least measureable fulness, but also in concise and orderly succession, but there is great need for it. It has been the aim of the author to write such a book. Only those varieties of clover are discussed at length which are possessed of economic value. The treatment of the subjects...

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