ACUTE PNEUMONIA. 



no liquefaction of the medium. On sloped agar it forms a 



FIG. 60. Friedlander's pneumobacillus, 1 

 from a young culture on agar ; showing some 

 rod-shaped forms. 



Stained with thionin-blue. x 1000. 



very white growth with a shiny lustre, 

 which, when touched with a platinum 

 needle, is found to be of a viscous 

 consistence. In cultures much longer 

 rods are formed than in the tissues 

 of the body (Fig. 60). On the sur- 

 face of potatoes it forms an abundant 

 moist white layer. Friedlander's 

 bacillus has active fermenting powers 

 on sugars, though varieties isolated 

 by different observers vary in the 

 degree in which such powers are 

 possessed. It always seems capable of acting on dextrose, 

 lactose, maltose, dextrin, and mannite, and sometimes also 



FIG. 59. Stab cul- 

 ture of Friedlander's 

 pneumobacillus in 

 peptone gelatine, show- 

 ing the nail -like ap- 

 pearance ; ten days' 

 growth. Natural size. 



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. 



