This is a classic textbook on the subject of plant biology, first published in 1920. It offers the reader an elementary course on the scientific method while exploring the relationship between plant life and general biological knowledge. Originally intended for use in schools and universities, this comprehensive textbook is a great place to start for readers with an interest in botany and related subjects. Contents include: ?The Plant as a Machine?, ?The Cell?, ?Respiration?, ?The Water Relations of Plants?, ?Absorption of Mineral Salts?, ?Carbon Assimilation?, ?The Assimilation of Nitrogen by Plants?, ?The Nutrition of Heterophic Plants?, ?Enzymes?, ?Reproduction?, ?Reproductions?, ?Reproductions (continued)?, etc. Many vintage books such as this are increasingly scarce and expensive. It is with this in mind that we are republishing this volume now in an affordable, modern, high-quality edition complete with a specially-commissioned new introduction on botany.