PLATE IV. 



FIG. i. Micrococcus tetragonus. 



Tube inoculated from a plate-cultivation of bacteria in 

 sputum. The cultivation consisted of a milk-white 

 growth heaped up on the surface of the gelatine and 

 growing freely along the upper part of the needle 

 track. 



FIG. 2. Bacterium pneumoniae crouposae. 



Micrococcus pneumonia crouposce. 

 Friedlander s pneitmo- coccus. 



Tube inoculated from pneumonic exudation. The growth, 

 in nutrient gelatine, in the form of a round-headed 

 nail is not by itself distinctive. 



FIG. 3. Saccharomyces niger. 

 Black torula. 



Tube inoculated from an old contaminated nutrient 

 gelatine cultivation. The growth, isolated and re- 

 inoculated, formed a black crust on the surface of 

 the gelatine. In some of the tubes little separated 

 centres of growth occurred in the upper part of 

 the track of the needle. 



