PREFACE TO THE SECOND EDITION. 



DURING the last three years numerous advances in our 

 knowledge of the diseases dealt with in this part have 

 taken place. These as far as possible are included in this 

 edition. 



I have to thank Dr. H. B. Newham, now Director of 

 the London School of Tropical Medicine, for aid in 

 revision of proofs and for many valuable suggestions. 



C. W. D. 



