GROWTH ON DIFFERENT CULTURE MEDIA 201 



Among the cultural appearances the following are of most 

 importance : 



Fig. 142. — Broth cultures X |. 1, uninoculated transparent broth; S, 

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

 deposit, in bottom; ^, 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. Whether the 



