Heredity and evolution in plants (1920) (14783456553)

Identifier: heredityevolutio00gage (find matches)
Title: Heredity and evolution in plants
Year: 1920 (1920s)
Authors: Gager, C. Stuart (Charles Stuart), 1872-1943
Subjects: Heredity Plants -- Evolution
Publisher: Philadelphia, P. Blakiston's Son & Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library



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n times. The lowlands of this period doubtless swarmed withreptiles such as shown in the picture, and with other animals, nowextinct. Some specimens of the giant dragon-flies had a spread ofwings of two feet. The fern-like trees and the bushy plants in the fore-ground are Cycadofilicales. To the right of the water are wide stretchesof the huge scouring rush (Calamites); on the left bank of the stream arethe unbranched Sigillarias (still as prominent as earlier in the coalperiod), and on higher ground to the left the branched Lepidodcndrons.One must view this scene as one of many such landscapes, with ever-varying detail, along streams and inlets. Cordaites, which in laterDevonian time made the first great forests of which there is record, isstill present, though not shown. So, too, there are hidden in the recessesof the forest the forerunners of the modern coniferous types, as well asother forms destined to give rise to the angiosperms. (Landscape fromWilliston, adapted from Neumayr.)
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HEREDITY AND EVOLUTION IN PLANTS BY C. STUART GAGER DIRECTOR OF THE BROOKLYN HOTANIC GARDEN WITH 113 ILLUSTRATIONS PHILADELPHIA P. BLAKISTONS SON & CO. 1012 WALNUT STREET1920 COPYRIGHT, 1920, BY P. BLAKISTONS SON & Co. TJIK M A I 1. K I K K S S V « » K K. 1*A To the Memory ofBENJAMIN STUART GAGER What a science Natural History will bewhen . . . all the laws of change are thoughtone of the most important parts of NaturalHistory. -Charles Darwin. iLetler lo J. D. Hooker.) PREFACE The present little book was originally intended to bemerely a reprint of Chapters XXXI to XXXVIII of theauthors Fundamentals of Botany. The reprinting of thosechapters was suggested by comments received from variouscorrespondents, who pointed out that the subject matterwhich they cover had not been elsewhere presented in soconcise a treatment in one volume, and in a mannersuited, not only to beginning students, but also to moregeneral readers. The chapter on Experimental Evolu-tion has received the ap