132 BACTERIOLOGY 



The agar-agar should be completely dissolved separately 

 in about 100 c.c. of water in the autoclave while the other 

 ingredients are being prepared. The latter should be filtered 

 and the dissolved agar-agar added to the filtrate. 



A complete list of the special media would be too volu- 

 minous for a book of this size. For their description the 

 reader is referred to the current literature. Those that have 

 been given above will suffice for obtaining a clear under- 

 standing of the principles of the subject. In the chapters 

 upon the Pathogenic Bacteria such special media as have 

 proved of use for purposes of identification and differentiation 

 are described in detail. 



