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.