PLATE I. 



FIG. 



1. B. FLUORESCENS LIQUEFACIENS. Surface colony on a 



gelatine-plate x 1 00 ; forty-eight hours growth at 

 22 C. Liquefaction has commenced. 



2. B. FLUORESCENS LIQUEFACIENS. Surface colony on a 



gelatine-plate x 1 00 ; twenty-four hours growth at 

 22 C. 



3. B. ARBORESCENS. Surface colony on a gelatine-plate 



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



4. B. ARBORESCENS. Early stage of colonies ; of tenseen in 



the depth of gelatine-plates. 



5? B. FLUORESCENS NON-LIQUEFACIENS. Surface colony on a 

 gelatine-plate x 1 00 ; forty-eight hours growth at 

 22 C. 



6. B. AQUATILIS. Surface colony on a gelatine-plate x 100; 



forty-eight hours growth at 22 C. 



7. B. ERYTHROSPORUS. Surface colony on a gelatine-plate 



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



5. B. MESENTERICUS VULGATUS. Surface colony on a gela- 



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



