74 VETERINARY BACTERIOLOGY 



Miscellaneous Changes. Many changes are brought about 

 by bacteria other than those which are here discussed. Micro- 

 organisms are of importance in tanning, curing of tobacco, the 

 preservation of food-stuffs, such as silage and sauer-kraut, the 

 retting of flax and hemp, the curing of the so-called burnt or 

 heated hay, and in many other ways. It is to be remembered that 

 probably in all cases these changes are brought about by the 

 enzymes produced by the bacteria. 



