TRANSLATOR'S PREFACE. 



A TEXT-BOOK written by one of the foremost 

 exponents of the honoured Danish School of 

 Micro-Biological Research, and by a pioneer of 

 world-wide reputation in the industrial applica- 

 tion of selected types of yeast, is certain of a 

 welcome from English readers. 



In comparison with the enormous output of 

 works on the organisms of disease, little has 

 yet been published in English on the technical 

 applications of Micro-Biology. This book covers 

 ground which is not fully surveyed in any existing 

 treatise. The necessity of embodying the results 

 of ten years' research has led to such a mass of 

 additions and alterations in the last English 

 edition that this must be regarded as a new 

 work. It is based on the fifth German edition. 



S. H. DA VIES. 

 YORK, 



December, 1910. 





