BY R. GREIG SMITH. 441 



measure about 1 p, and when taken from cultures on solid media 

 are found in sets of two and four. In fluid culture they occur in 

 badly defined packets. There is a filiform growth with a raised 

 nail-head in gelatine stab culture, and on gelatine plates the 

 colonies are circular and, when magnified, appear finely granular 

 and smooth-edged. 



Bacterium album. 



Bacillus albtis, Eisenberg. 



On agar stroke there is formed a porcelain-white, narrow, 

 convex layer with a smooth edge. The consistency is firm or 

 leathery, and there is produced a strong latrine odour. The 

 bacterium is a rod with rounded ends, is actively motile and 

 measures 0*4 : 1-2 p. It does not stain when treated by Gram's 

 method. The colonies on agar are porcelain-white and raised. 

 In gelatine the surface colonies are irregular and white. Under 

 a moderate power the margin is seen to be lacerate-erose, the 

 centre marbled (B. coli commune type). The deep colonies are 

 circular, zonate, and have a smooth edge. In gelatine stab 

 culture the needle track is filiform; at the top there is a white, 

 flat nail-head which spreads irregularly. The upper part of the 

 stroke becomes tuberculate. No gas is produced in glucose- 

 gelatine, and milk is not coagulated. Bouillon becomes very 

 turbid, and a white precipitate and surface ring is formed. The 

 indol reaction was not obtained. The growth on potato is white, 

 moist glistening, and spreads over the surface; it ultimately 

 becomes stone-coloured. The organism grows well at 22° C, but 

 not at 37° C. 



Eisenberg describes the potato culture as restricted to the 

 place inoculated. 



Bacterium sinuosum, Wright. 



On the agar slope there is formed a thin, translucent white 

 layer from which amoeboid processes extend and cover the agar 

 surface. The growth on gelatine is rather thin; the colonies 



