APPEARANCE OF GROWTH ON CULTURE MEDIA 215 



Among the cultural appearances the following are of most 

 importance : 



Fig. 141.— Broth cultures X i 1, uninoculated transparent broth; 2, 

 broth cloudy from growth of organisms; 3, broth slightly cloudy with a 

 deposit in bottom; 4, broth slightly cloudy with a heavy membrane at the 

 surface. 



In broth cultures the presence or absence of growth on 

 the surface and the amount of the same. Wliether the 



