138 PATHOGENIC BACTERIA. 



It is not intended that the student shall infer that 

 there are no culture-media other than these, which have 

 been selected because of their usefulness and popularity. 

 Many other compounds and as many simple substances 

 are employed ; for example, eggs, white of egg, urine, 

 bread, sputum, sugar solutions, hydrocele fluid, and 

 aqueous humor. 



