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Elements of Agricultural Chemistry and Geology (Paperback) Loot Price: R267
Discovery Miles 2 670
Elements of Agricultural Chemistry and Geology (Paperback): James Finlay Weir Johnston

Elements of Agricultural Chemistry and Geology (Paperback)

James Finlay Weir Johnston

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Loot Price R267 Discovery Miles 2 670

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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: CHAPTER III. Structure of plants?Mode in which their nourishment is obtained ?Growth and substance of plants?Production of their substance from the food they imbibe?mutual transformations of starch, sugar, and woody fibre. From the compound substances, described in the preceding chapter, plants derive the greater portion of the carbon, hydrogen, oxygen, and nitrogen, of which their organic part consists. The living plant possesses the power of absorbing these compound bodies, of decomposing them in the interior of its several vessels, and of recompounding their elements in a different way, so as to produce new substances,? the ordinary products of vegetable life. Let us briefly consider the general structure of plants, and their mode of growth. STRUCTURE OF THE STEM AND ROOT OF PLANTS. 29 SECTION I. OF THE STRUCTURE OF PLANTS AND THE MODE IN WHICH THEIR NOURISHMENT IS OBTAINED. A perfect plant consists of three several parts,? a root which throws out arms and fibres in every direction into the soil,?a trunk which branches into the air on every side,?and leaves which, from the ends of the branches and twigs, spread out a more or less extended surface into the surrounding air. Each of these parts has a peculiar structure and a special function assigned to it. The stem of any of our common trees consists of three parts,?the pith in the centre, the wood surrounding the pith, and the bark which covers the whole. The pith consists of bundles of minute hollow tubes, laid horizontally one over the other; the wood and inner bark, of long tubes bound together in a vertical position, so as to be capable of carrying liquids up and down between the roots and the leaves. When a piece of wood is sawn across, the ends of these tubes may be distinctly seen. The branch is only ...

General

Imprint: Rarebooksclub.com
Country of origin: United States
Release date: May 2012
First published: May 2012
Authors: James Finlay Weir Johnston
Dimensions: 246 x 189 x 3mm (L x W x T)
Format: Paperback - Trade
Pages: 54
ISBN-13: 978-1-4590-4411-1
Categories: Books
LSN: 1-4590-4411-8
Barcode: 9781459044111

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