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Synopsis The course of work followed in this book is directed, in the main, to the establishment of the fundamental principles of Plant Physiology. Plant Morphology receives a less exgended tratment; but this aspect on the subject is freely introduced in the discussion of Plant Ecology, i.e. the relation of the structure and functions of plants to their habitat. More space has been devoted to Ecology than is usual in an elementary textbook, but the Author believes that this respect of plant life gives to field work a more definite aim, and broadens the outlook of the student by linking up Botany with the study of climate, geology, and topography. Similarly, to avoid the weariness of lessons dealing merely with the comparison of forms, and Author has throughout treated the forms of roots, stems, and leaves in relation to their functions and to the habitat of the plant.