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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: $amttbing of rinr. Without inflicting on the reader a misplaced disquisition on Botany, or its correlative science, Vegetable Physiology, it may be here explained that the leaf, considered in its physiological relations, is to the plant what the digestive and breathing organs are to the animal. Its porous structure permits it to be permeated by moisture drawn up from the soil through the root and stem, and also by the air in which it so incessantly vibrates. These elements, charged with Drinciples adapted to the nutriment of the plant, meet in the leaf-tissue, where they are metamorphosed into the true elements of growth, and elaborated into new cells fitted to develop and increase the living and growing plant. By what subtle influences the sun's ray, acting on these gaseous and liquid particles, works to such marvellous ends, producing the innumerable vegetable forms, from the slender grass to the massive oak, and all the infinite variety of fruits of the field and flowers of the meadow and garden, Science has in vain sought to answer. Only the microscope, through its mysterious reveal- ings, points to the cell as the initial, almost infinitely minute, alembic in which this inscrutable and beneficent synthesis is ever going on. What the older botanists were wont to call nerves, but the modern have named veins, are spread more thoroughly over the leaf than would appear from an examination of the surfaces: in fact, the loosely distributed cellular tissue is everywhere traversed by these ducts, conveying the sap to the extremities, there to be subjected to the subtle chemistry of the cell. The mode of distribution of these veins is one of the leading characteristics observed in the classification of plants. The two great divisions of Endogens and Exogens, having distinct m...
| ISBN-13 | 9780217944731 |
|---|---|
| ISBN-10 | 0217944736 |
| Weight | 0.19 Pounds |
| Dimensions | 9.00 x 6.00 x 0.11 In |
| List Price | $11.21 |
| Format | Paperback |
|---|---|
| Pages | 48 pages |
| Publisher | |
| Published On | 2009-08-01 |
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