This book was originally intended as a text for students, and its primary purpose has not changed; it has, however, been increasingly used by practising farmers and, in order that it may serve their needs also, the authors have been at pains to avoid the use, without explanation, of such scientific terms as have not yet become part of our farming vocabulary. A great part of the book has been rewritten and much new material has been added. The pace of progress in farm science and technology is now such that any sizable book must inevitably be out of date, in some respect, before it leaves the press. In the present case the most important failing is with respect to various noteworthy developments in the field of farm chemicals (weed killers, insecticides, etc.) which occurred in the few months preceding publication.
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