EXPERIMENT STATION BULLETINS. 347 



THE USEFULNESS OF CURVES IN THE INTERPRETATION OF 

 MICROBIAL AND BIOCHEMICAL PROCESSES 



BY OTTO RAHN 



Technical Bulletin No. 5. 



FOREWORD. 



The general discussion contained herein is so intimately pertinent to 

 the many problems in the broad fields of dairy and soil microbiology 

 that it seems wise to issue it in the form of a separate bulletin. To 

 make it a part of any bulletin representing specific investigations would 

 be abortive and much of its utility would be lost. 



Such general surveys of knowledge sei-ve a function almost as great 

 as delving into unknown recesses for new facts, because they not only 

 have a tendency to formulate findings already available, but they effect- 

 ively shape the course of investigations and institute systematic effort. 

 Accordingly, the author has served a purpose which will be helpful in 

 the investigations of this institution and other institutions as well. 



Charles E. Marshall. 



