vi BACTERIOLOGY 



parasitism of protozoa, and on the action of light on 

 bacteria, and this has been done in an appendix, for 

 which the Translator alone is responsible. He has en- 

 deavoured to comply with the Author's intention by 

 describing practical details with considerable fulness, but 

 has thought it best to depart from the rule of not giving 

 references, the observations on these subjects being so 

 recent that certainty has not yet been attained. These 

 remarks apply also to the note at the end of Chapter X. 

 on Sabouraud's recent researches. A few additional 

 methods and formulae have also been given, the body of the 

 work has been divided into chapters, and the index greatly 

 extended. 



The Translator has to express his thanks for assistance 

 on individual points from various sources, but especially 

 to Professor Schenk for his unvarying courtesy and readi- 

 ness in affording additional information ; and to acknow- 

 ledge occasional obligations to many of the leading English 

 and German text-books. 



W. R. DAWSON. 



DUBLIN : June 1893. 



