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
