C UL 77 VA T10N OF PNE UMOBA CIL L US. 



193 



with a shiny lustre, which, when touched with a platinum 

 needle, is found to be of a viscous consistence. In 



FIG. 54. Friedlander's pneumobacillus, 1 

 from a young culture on agar ; showing some 

 rod-shaped forms. 



Stained with thionin-blue. x 1000. 



f 



FIG. 53. Stab 

 culture of Fried- 

 lander's pneumo- 

 bacillus in peptone 

 gelatine, showing the 

 nail-like appearance ; 

 six days' growth. 

 Natural size. 



cultures much longer rods are formed 

 than in the tissues of the body (Fig. 

 54). On the surface of potatoes it 

 forms an abundant moist white layer. 

 Friedlander's bacillus has active fer- 

 menting powers on sugars, though 

 varieties isolated by different observers 

 vary in the degree in which such powers 

 are possessed. It always seems cap- 

 able of acting on dextrose, lactose, maltose, dextrin, and 

 mannite, and sometimes also on glycerine. The substances 

 produced by the fermentation vary with the sugar fermented, 

 but include ethylic alcohol, acetic acid, laevolactic acid, 

 succinic acid, along with hydrogen and carbonic acid gas. 



1 The apparent size of this organism, on account of the nature of its 

 sheath, varies much according to the stain used. If stained with a strong 

 stain, e.g., carbol-fuchsin. its thickness appears nearly twice as great as is 

 shown in the figure. 



13 



