TRANSCRIBER’S NOTE Italic text is denoted by _underscores_. Bold text is denoted by =equal signs=. A superscript is denoted by ^x or ^{xx}, for example P^2O^5. A subscript is denoted by _{x}, for example NH_{4}OH. Basic fractions are displayed as ½ ⅓ ¼ etc; other fractions are shown in the form a/b, for example 4/10 or 1/40. The tables in this book are best viewed using a monospace font. Some minor changes to the text are noted at the end of the book. THE DIAGNOSTICS AND TREATMENT OF TROPICAL DISEASES BY E. R. STITT, A. B., PH. G., M. D., SC. D., LL. D. REAR ADMIRAL, MEDICAL CORPS, AND SURGEON GENERAL, U. S. NAVY, GRADUATE, LONDON SCHOOL OF TROPICAL MEDICINE; MEMBER NATIONAL BOARD OF MEDICAL EXAMINERS; MEMBER ADVISORY BOARD, HYGIENIC LABORATORY. FORMERLY: COMMANDING OFFICER AND HEAD OF DEPARTMENT OF TROPICAL MEDICINE, U. S. NAVAL MEDICAL SCHOOL; PROFESSOR OF TROPICAL MEDICINE, GEORGETOWN UNIVERSITY, PROFESSOR OF TROPICAL MEDICINE, GEORGE WASHINGTON UNIVERSITY; LECTURER IN TROPICAL MEDICINE, JEFFERSON MEDICAL COLLEGE; ASSOCIATE PROFESSOR OF MEDICAL ZOOLOGY, UNIVERSITY OF THE PHILIPPINES FOURTH EDITION—REVISED WITH 159 ILLUSTRATIONS LONDON H. K. LEWIS AND CO., LTD. 1922 COPYRIGHT, 1922, BY P. BLAKISTON’S SON & CO PRINTED IN U. S. A. BY THE MAPLE PRESS YORK PA PREFACE TO FOURTH EDITION In this revision it has seemed desirable to adhere to the original plan of the manual as such an arrangement of the contents gives to the student or tropical practitioner a concise and readily accessible presentation of the subject. Accepting the spirochaetal etiology of yellow fever, as worked out by Noguchi, I have transferred the chapter on this disease to the section dealing with protozoal diseases and have endeavored to present the more important features of the recent extensive additions to our knowledge concerning this scourge of the tropics. There is not a chapter in the book that has not been carefully revised and brought up to date. Of the revisions made, the most important deal with advances in the study of food deficiency diseases, as will be noted under beriberi and pellagra. I have enlarged various paragraphs on treatment, the additions including descriptions of the treatment of hookworm disease by carbon tetrachloride and of the methods of administering arsphenamine and antimony.