PREFACE TO THE SEVENTH EDITION. 



The outstanding feature of the interval that has elapsed since 

 the sixth edition of this work appeared is the impetus given 

 to bacteriological research by the urgent requirements of 

 practical medicine and surgery in the war. The success which 

 has attended the efforts put forth is shown in the additions we 

 have made to the chapters dealing with cerebro-spinal fever, 

 with intestinal infections, — both bacterial and protozoal, — with 

 tetanus, and with the grave conditions occurring in wounds. It 

 is manifest likewise in the inclusion of new sections on infective 

 jaundice and also on trench fever, which observations in both 

 the field and the laboratory have differentiated from allied 

 affections. Apart from aspects of bacteriology brought into 

 prominence through the war, the whole book has been 

 thoroughly revised, a number of new methods have been 

 described, and new illustrations have been added. 



October 1918. 



