4 THE AMOEBAE UVING IN MAN 



out in London at the Wellcome Bureau of Scientific Research. My best 

 thanks are again offered to the Director, Lieut.-Col. Andrew Balfour, 

 C.B., C.M.G., and all his staff, for their hospitality and unfailing help 

 at all times and on all occasions. The work itself has been done with 

 the aid of grants from the Medical Research Committee, and without 

 this assistance would have been impossible. In addition to this general 

 acknowledgement of my indebtedness to the Committee, I should like 

 to place on record my deep obligation to their Secretary, Sir Walter 

 Fletcher, K.B.E., who not only enabled me in the first place to begin 

 the work, but who also, by constant help and encouragement, insured 

 its accomplishment. 



To all those mentioned and to many others my thanks are due and 

 gratefully offered. Nevertheless, I take full responsibility for all the 

 views expressed in the following pages ; and if I have fallen into 

 errors, the fault is mine, and not attributable to those who have helped 

 me. In compiling the present memoir I have endeavoured on all 

 occasions to give credit to every worker for his own discoveries, and 

 any omissions in this respect — for such oversights are, I fear, inevitable 

 — are unintentional. I am well aware, moreover, that in a subject of 

 such magnitude and complexity there is little to be said that is really 

 new. My aim has been to set down what is true rather than what is 

 novel. For myself, therefore, I would only say, in the words of that 

 wise old philosopher, John Locke: "Truth needs no recommendation 

 and error is not mended by it ; in our inquiry after knowledge, it 

 little concerns us what other men have thought." 



