vi PREFACE 



have not done injustice, however unintentionally, to some authors; 

 have not made errors of transliteration or otherwise; and for all 

 these we ask the reader's indulgence, and beg him to remember 

 that during the war it has been most difficult for us to obtain the 

 time necessary for the preparation of this work. 



We desire to record our grateful appreciation of the kind help 

 received from Colonel Leiper, Major Low, and Professor Simpson. 



We gratefully acknowledge the kindness of the following authors 

 or their proxies, as war conditions have prevented our direct 

 communication, in giving us permission to copy illustrations: — 

 General Sir Havelock Charles, Colonel Sir James Cantlie, Colonel 

 Balfour, Colonel Wenyon, Colonel Stephens, Colonel Richard P. 

 Strong, Major Brought on Alcock, Captain O'Connor, Dr. Chris- 

 topherson. Princess de Poix, Mr. Wellcome, Professor Pinoy, 

 Professor Legroux, Professor Hewlett, Dr. Sambon, Dr. James, 

 Mr. Hirst, Miss Carter, Dr. G. C. Shattock, Dr. Jackson, Dr. Lurie, 

 and Dr. Guilliermond. 



We more especially desire to thankfully' acknowledge the 

 generosity with which Dr. J. J. Bell has placed so many of his 

 valuable photo-micrographs at our disposal. 



We have much pleasure in acknowledging our indebtedness to 

 the Tropical Diseases Bulletin, which has been invaluable to us. 



The index has been prepared by Miss James, to whom we tender 

 our best thanks. 



Finally, we wish to acknowledge the constant kindness and 

 courtesy which we have received from our publisherr, Messrs. 

 Bailliere, Tindall and Cox. 



ALDO CASTELLANI. 

 ALBERT J. CHALMERS. 



London, 



August, 1919. 



