PLATE IV. 



FIG. 



1. B. ENTERITIDIS, GARTNER. Surface colony in a gelatine- 



plate x 100; seventy-two hours growth at 22 C. 



2. B. COLI COMMUNIS. Surface colony in a gelatine-plate 



x 100; forty-eight hours growth at 22 C. 



3. B. TYPHOSUS. Surface colony in a gelatine-plate x 100; 



four days growth at 22 C. "Ridges and valleys" 

 well marked. 



4. B. ACIDI LACTICI. Surface colony in a gelatine-plate 



x 100; seventy-two hours growth at 22 C. 



5. B. TYPHOSUS. Surface colony in a gelatine-plate x 100; 



four days growth at 22 C. " Glass pellicle " variety 

 of colony. 



6. B. CAVICIDA. Surface colony in a gelatine-plate x 100; 



forty-eight hours growth at 22 C. 



7. B. PYOCYANEUS. Surface colony in a gelatine-plate 



x 100; thirty-six hours growth at 22 C. Lique- 

 faction just commencing. 



8. 13. VIOLACEUS. Surface colony in a gelatine-plate x 100 ; 



forty-eight hours growth at 22 C. The colony has 

 a violet colour. Liquefaction has not commenced. 



