"l / ^'o.S.4-bfoK ^oofe F LIBRARY RULES This bookmay bekepL.-CiO.^ weeks. A fine of two cents will becharged for each day books or magazinesarekeptovertime. Twobooks may be borrowed from the Library at one time. Any book injured or lost shall be paid forby the person to whom it ischarged. No member shall transfer his right touse the Library toany otherperson. THE GEOMETRY OF RENÉ DESCARTES TRANSLATED FROM THE FRENCH AND LATIN BY DAVID EUGENE SMITH AND MARCIA LATHAM L. WITH A FACSIMILE OF THE FIRST EDITION, 1637 CHICAGO LONDON • THE OPEN COURT PUBLISHING COMPANY 1925 C D6 Copyrightby THE OPEN COURT PUBLISHING COMPANY 1925 PRINTED IN THE UNITED STATES OF AMERICA