Produced by Bryan Ness, Jens Nordmann and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/Million Book Project) AGRICULTURAL AND BIOLOGICAL PUBLICATIONS CHARLES V. PIPER, CONSULTING EDITOR THE CHEMISTRY OF PLANT LIFE +--------------------------------------------------------------+ | | | McGraw-Hill Book Co. Inc. | | | | PUBLISHERS OF BOOKS FOR | | | | Coal Age Electrical Railway Journal | | Electrical World Engineering News-Record | | American Machinist Ingenieria Internacional | | Engineering & Mining Journal Power | | Chemical & Metallurgical Engineering | | Electrical Merchandising | | | | | +--------------------------------------------------------------+ THE CHEMISTRY OF PLANT LIFE BY ROSCOE W. THATCHER, M.A., D.AGR. DEAN OF THE DEPARTMENT OF AGRICULTURE AND DIRECTOR OF THE AGRICULTURAL EXPERIMENT STATIONS. UNIVERSITY OF MINNESOTA (FORMERLY PROFESSOR OF PLANT CHEMISTRY. UNIVERSITY OF MINNESOTA) FIRST EDITION SECOND IMPRESSION MCGRAW-HILL BOOK COMPANY, INC. NEW YORK: 370 SEVENTH AVENUE LONDON: 6 & 8 BOUVERIE ST., E. C. 4 1921 COPYRIGHT 1921; BY THE McGRAW-HILL BOOK COMPANY, INC. PREFACE