Preface 



be kept strictly in view ; and from the Medical Eesearch Committee, who 

 not only gave more than ample financial credit for the field expenses, and 

 to illustrate this Keport, but also maintained, through Sir W. M. Fletcher, 

 F.E.S., a gracious interest in the progress of the work. 



Thanks are due to Sir David Bruce for privileges enjoyed under his 

 command at Millbank, and to the officials of the Zoological Society of 

 London, especially to Dr. Chalmers Mitchell and Mr. K. I. Pocock, F.E.S. , 

 for supervising the supply by dealers of properly identified Cercocebus 

 fiiUgi)iosus, which w^ere the mainstay of the experimental work. 



I have also to express my sense of indebtedness to the Committee of 

 the London School of Tropical Medicine for most generously enabling 

 rae to continue under Army auspices a series of investigations which they 

 had initiated during 1913, and which they would probably have supported 

 alone to a successful conclusion if more peaceful times had prevailed. 



London School of Tropical Medicine, E. T. Leiper. 



Albert Dock, London, E., 



March 12th, 1918. 



EEEATA. 



I am indebted to Dr. Shipley, Master of Christ's College, for drawing attention to a number 

 of errors in the text, and particularly to the following, which escaped correction in the proofs: — 

 Page 8, line 2, read intermediari animali di classe. 

 ,, ,, ,, 3, ?-ead alio sviluppo. 



,, ,, ,, 4, read il suo ciclo vital(^, . . . parassita . . . 

 ,, ,, ,, 5, ?cad e forse senza riproduzione. 

 ,, 9, ,, 22, /or bef read bei. 

 ,, ,, ,, 32, /or stezeu rearf setzen. 

 ,, 17, ,, 27, ?-cad profond mystere. 



,, 20, ,, 39, for il y a diserieuses read il y a de s^rieuses. 

 ,, 21, ,, 3, /or le renvoi r 7Yarfle renvoi. 

 ,, 21, ,, 9, for pent ou on obteuir read pent on en obtenir. 

 ,, 21, ,, 10, read ce dernier point est de la plus haute importance. 

 Pages various, /or B. hamatobiuvi read B. liamatobia. 



It is stated, on p. 62, that at Isniailia unfiltered water is actually laid on to supply the bath- 

 rooms in European houses. I am informed by the Public Health Department in Cairo that this 

 is incorrect. The generalisation that unfiltered water was used in baths is based solely upon 

 my own experience during a short stay in Ismailia. 



