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The book has been written like a text in other fields is at present not to be found. This book, which has grown out of a series of lectures given at all universities is planned to meet the need for a new presentation. Plant physiology is largely a combination of elementary botany, physics, and chemistry. It is, therefore assumed that the student has an elementary knowledge of these contributing sciences. Often a problem of plant physiology can be clarified by material from animal or general physiology. Agronomists may wish there was more mention of field crops, horticulturists may lament the lack of horticultural illustrations, and general physiologists may possibly decry the lack of references to work done on the simpler plants and animals, but a book in general plant physiology must be an introduction to all of its branches; specialization can then follow later. I have aimed to make the drawings and illustrations as helpful as possible. The photographs of botanists were very kindly supplied to me in response to a request. The references at the end of each chapters are intended to supplement the text, and are not merely lists of articles cited in it. Students will enjoy going a little deeper into a subject than their fellows and for them these lists of references are appended. Bibliographies can always be obtained from the articles cited. All that a real student needs is to be placed at one end of the bibliographic trail.