42 



CLINICAL BACTERIOLOGY AND 



2. In gelatin (stab culture) after twenty-four hours a fili- 

 form growth occurs. No liquefaction of gelatin. 



3. On agar a moderate growth, slightly raised, surface 

 moist and glistening, of a sticky consistence. 



4. On potato after twenty-four hours growth rather abun- 

 dant, surface uneven, moist and glistening, raised and of a 

 light tan colour, which darkens with age. 



77-7TT. 



^m^m^Mm 



i. 



Fig. 20. — Surface Elevation of Colonies. 



(1) Flat. (2) Raised. (3) Convex. (4) Conical. (5) Umbilicate. 



5. In litmus milk after five days colour of medium at top 

 deep blue, with a brown sediment at the bottom. 



Staining. — Loeffler's methylene blue. 



Microscopical Appearances. — A short, narrow bacillus, 

 single or in pairs, chains, or even filaments. 



Aerobic. — Optimum temperature, 37° C. 



