Fig. 43. . 

 Stained impression of a recent colony of B. pestis on gelatine. x 1000. 



Figs. 44 and 45. 



Two ghee broth cultures of B. pestis, each holding 1500 cc. of culture 

 fluid, showing developing surface pellicle with stalactites ; the broth is clear ; 

 at the bottom masses of granular sediment — former stalactites that had 

 become detached. Eeduced size. 



