FRIEDLANDER'S PNEUMOBACILLUS. 



209 





pneumobacillus, 



(2) Friedldnders Pneumobacillus. As seen in the sputum 

 and tissues, this organism both in its appearance and arrange- 

 ment, as also in the presence of a capsule, somewhat resembles 

 Fraekel's pneumococcus, and 

 it was at first described as the 

 "pneumococcus." The form, *: 



however, is more of a short . j? 



rod shape, and it has blunt, -'^ 



rounded ends; it is also rather <'-.' * *V ^^ : 



broader than Fraenkel's pneu- 

 mococcus. It is now usually ^ 

 classed amongst the bacilli, 

 especially in view of the fact , **"* 

 that in cultures elongated rod 

 forms may occur (Fig. 78). 

 The capsule has the same 



, - I<IG. 7. f nediander's pneumobacillus, 



general characters as that of showing the variations in length, also cap- 



Fraenkel's Organism. Fried- sules - Film Preparation from exudate in a 



case of pneumonia, x 1000. 



lander s pneumobacillus stains 



readily with the basic aniline stains, but loses the stain in Gram's 

 method, and is, accordingly, coloured with the contrast stain, 



safranin or Bismarck-brown, 

 as above recommended. A 

 valuable means is thus af- 

 forded of distinguishing it 

 from Fraenkel's pneumococ- 

 I cus in microscopic prepara- 

 1 tions. 



/ Friedlander's organism is 

 much less frequently present in 

 pneumonia than Fraenkel's ; 

 sometimes it is associated with 

 the latter, very rarely it occurs 

 alone. 



In sputum preparations 

 the capsule of both pneumo- 

 cocci may not be recognisable, 

 and the same is sometimes true of lung preparations. This is 

 probably due to changes which occur in the capsule as the 

 result of changes in the vitality of the organisms. Sometimes 



FlG. 79. Fraenkel's pneumococcus in 

 serous exudation at site of inoculation in a 

 rabbit, showing capsules. Stained by Rd. 

 Muir's method. X 1000. 



