PREFACE TO THE THIRD EDITION 



The second edition of this manual went out of print some years ago. 

 The war, however, prevented us from preparing a revise at an earher 

 date, and the same cause has introduced many difficulties in the 

 preparation of this edition. 



We have been compelled to rewrite large portions of the book, and 

 have taken the opportunity to introduce certain subjects hitherto 

 omitted, and also greatly to increase the number of illustrations. 



In order to keep down the size, we have omitted the list of figures 

 and the index of authors' names. Notwithstanding this, the manual 

 has become somewhat unwieldy, but we retain it in the form of one 

 volume because our experience in the tropics makes us believe that 

 this is the most convenient form for the tropical practitioner and 

 student alike. 



As regards nomenclature of parasites, we have followed, as in 

 previous editions, the rules of the International Committee; but 

 as regards the names of the diseases, we are using, in most instances, 

 the commonly known names. 



Much of the work detailed therein is original and based upon 

 our life and experience in the tropics, in which we have resided 

 upwards of or exceeding two decades. We know how soon a work 

 on tropical medicine becomes antiquated, and we have ventured to 

 look ahead, as subjects which to-day are nebulous and attract little 

 attention may become of general interest and importance in a few 

 years. 



When we consider the mass of material which we have been 

 compelled to handle in the preparation of this edition, it is impossible 

 for us to hope that we have not omitted reference to important facts; 



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