The book Geology for Teachers Classes And Private Students was written by author Tenney, Sanborn, 1827-1877 Here you can read free online of Geology for Teachers Classes And Private Students book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Geology for Teachers Classes And Private Students a good or bad book?
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PELENOGAMOUS PLANTS bear true flowers, and produce seeds having a seed-leaf or seed-leaves, called cotyledon or cotyledons, in which is enveloped a ready-formed embryo, the germ of a new plant. This branch embraces all the higher forms of vegeta- tion, and naturally divides into two Classes, Exo- gens and Endogens. EXOGENS, or Outside Growers, comprise all plants whose stems are composed of three distinct parts, pith in the centre, bark outside, and wood, or woody (91) 92 THE VEGETABLE KINGDO^.... substance between the two. Although these parts are the most plainly exhibited in trees and shrubs, they are more or less distinctly indicated in many of the herbs, or soft- stemmed plants. Plants of this class have net-veined leaves, and bear seeds with two or more seed-leaves, and are often called Dicotyledons. The two parts into which a bean, a pumpkin seed, or an apple seed readily divides, are the cotyledons, and they form the first two leaves of the young plant. Exogens all grow by additions to the outside, a new layer being added just beneath the bark each year ; and thus the age of the shrub or tree is indi- cated by the number of concentric rings exhibited by a cross section of its stem or trunk.
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