TRANSLATORS' PREFACE. 



In preparing our translation of tliis little work^ whicli 

 has been made by arrangement with Dr. Migula^ we 

 have endeavoured to convey the author's meaning as 

 accurately as possible. In only a few instances has 

 new matter been added, and then invariably in the 

 form of footnotes. These footnotes will be found on 

 pages 7, 21, 105, 212, and 236. In addition the titles 

 of some English works and translations and the names 

 of some English manufacturers have been added in 

 the introduction. 



We trust that this book may prove useful to Eng- 

 lish students ; the painstaking way in which the 

 minutest practical details have been described will 

 render it, without doubt, especially serviceable to 

 those who have not had the opportunity of going 

 . through a systematic course on Bacteriology. 



M. AND H. J. CAMPBELt. 



London, 1893. 



