Front matter

Contents. List of Illustrations. (In certain versions of this etext, in certain browsers, clicking on this symbol , or directly on the image, will bring up a larger version of the illustration.) (etext transcriber's note)

The prickly pear (Opuntia chlorotica santarita) of the desert in the American Southwest. (This painting was kindly loaned by Dr. David Griffiths of the United States Department of Agriculture and reprinted here through the courtesy of the Journal of the International Garden Club, where it first appeared.) Courtesy Journal of the International Garden Club

Popular Science Library

EDITOR-IN-CHIEF GARRETT P. SERVISS AUTHORS WILLIAM J. MILLER HIPPOLYTE GRUENER A. RUSSELL BOND D. W. HERING LOOMIS HAVEMEYER ERNEST G. MARTIN ARTHUR SELWYN-BROWN ROBERT CHENAULT GIVLER ERNEST INGERSOLL WILFRED MASON BARTON WILLIAM B. SCOTT ERNEST J. STREUBEL NORMAN TAYLOR DAVID TODD CHARLES FITZHUGH TALMAN ROBIN BEACH ARRANGED IN SIXTEEN VOLUMES WITH A HISTORY OF SCIENCE, GLOSSARIES AND A GENERAL INDEX ILLUSTRATED VOLUME THIRTEEN P. F. COLLIER & SON COMPANY NEW YORK Copyright 1922 By P. F. Collier & Son Company MANUFACTURED IN U. S. A.