Principles of General and Comparative Physiology
Format: Paperback
ISBN13: 9780217976534
Paperback|9780217976534
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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: most frequently present themselves, may be thus classified. 1. Cellular Tissue. 2. Woody or Fibrous Tissue. 3. Vascular Tissue. It will be shown, however, that they may all be regarded as modifications of the same elementary forms; since they are all developed in the young plant from a common origin, and in the adult structure many intermediate links are found which connect them by almost imperceptible transitions. Still it is important for practical purposes to distinguish these different forms of tissue; since, when once fully formed, they do not appear susceptible of mutual transformation, and their functions in the economy of the plant are entirely different. 23. That which may be regarded as the most characteristic example of cellular tissue, exists in most pulpy fruits, as well as in the pith and other soft parts of the structure. It is simply a vesicle or minute sac of a globular or spheroidal figure, containing fluid to which its colour, if it presents any, is due, the membrane of which it is formed being transparent and colourless; thus, in the pith this tissue is white, in the leaves green, and in the petals of flowers it may be variously coloured. From its being composed of membrane alone, it is called membranous cellular tissue (Fig. 1). The rounded form is only exhibited when the vesicles are but loosely aggregated together, and it is then that the distinctness of their sides is most evident. When the tissue is more solid, the sides of the vesicles are pressed against each other, so as to become flattened, and to be in close apposition; and sometimes they adhere in such a manner, that the partition between two adjacent cells seems to be but a single instead of a double membrane. If the pressure to which the vesicle is subject be equal in all directions, the form ...
| ISBN-13 | 9780217976534 |
|---|---|
| ISBN-10 | 0217976530 |
| Weight | 1.58 Pounds |
| Dimensions | 9.00 x 6.00 x 1.10 In |
| List Price | $31.73 |
| Format | Paperback |
|---|---|
| Pages | 492 pages |
| Publisher | |
| Published On | 2009-08-01 |
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