PREFACE. 



with some detail, whilst other subjects have been only 

 shortly dealt with. Thus the book is also intended 

 to be a short text-book for physicians and chemists in 

 practice, if they wish to occupy themselves in their 

 short periods of leisure with such bacteriological 

 experiments as arise out of their work. 



The name Practical Bacteriology was suggested by 

 Strasburger's Practical Botany, although this work is 

 much more limited in scope. 



As to illustrations of apparatus, I have made these 

 as few as possible, in order to keep down the price of 

 the book, having aimed rather at indicating the special 

 form which I consider most suitable than at carefully 

 representing the instruments. This is less important, 

 since all price lists are now so fully illustrated. 



On the other hand, I considered it desii-able to in- 

 sert^ photographs of the most important pathogenic 

 bacteria, because good drawings as a rule are much 

 more distinct than the pictures under the microscope, 

 so that it is frequently enough said by my pupils, 

 " If only the bacteria were as distinctly to be seen as 

 in the picture ! " The difference between the micro- 

 scopical picture and the drawing is often so great, that 

 the beginner can hardly make out the resemblance 

 between them. W. Migdla. 



' Careful drawings of these photographs have been inserted 

 ;n place of tlie photographs themselves. 



