viii EDITOR'S PREFACE 



Medicine have arisen out of definite new discoveries 

 in the physical sciences, have followed upon the 

 development of fresh processes in the arts, or have 

 been gained by the labour of outstanding individuals. 

 The present series of Medical History Manuals 

 has for its object to describe some of these dis- 

 coveries, processes, and individuals, and to trace, in 

 each case, the epoch that has resulted. 



In this volume, Mr. Stephen Paget, F.R.C.S., 

 has outlined the life of Pasteur, justly regarded as 

 the founder of bacteriological methods in research, 

 and has described many means for the prevention 

 and expulsion of disease, which have been developed 



out of Pasteur's work. 



J. D. C. 



