FRIEDLANDER'S PNEUMOBACILLUS. 209 



(2) Friedldndcr s Pneimiobaci/liis. — 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 

 Fraenkel's pneumococcus, and 

 it was at first described as the 

 "pneumococcus." The form, *t 



however, is more of a short ^ . ^ 



rod shape, and it has blunt, '^ '' . 



rounded ends ; it is also rather - "• , >* ' 



broader than Fraenkel's pneu- • " . 



mococcus. It is now usually * ._ '■ ^ 



classed amongst the bacilli, 

 especially in view of the fact , -1 n.rn,^ 



that in cultures elongated rod ^ 



forms may occur (Fig. 78). / r^- 



The capsule has the same 



. , u c Fig. 78. — Friedlander's pneumobacillus, 



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



Fraenkel's organism. Fried- ^"'<=5- ^i'™ preparation from exudate in a 



■,.-,, , .,, . case of pneumonia. X 1000. 



lander s pneumobacillus stams 



readily with the basic aniline stains, but loses the stain in Grant 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- 

 ; cus in microscopic prepara- 

 * J tions. 



; , • Friedlander's organism is 



\ * ^ .* ', much less frequently present in 



^ * I . ^ >-« pneumonia than Fraenkel's ; 



sometimes it is associated with 

 ■* * 



"* .-^. the latter, very rarely it occurs 



alone. 



Fig. 79. — Fraenkel's pneumococcus in 



serous exudation at site of inoculation in a ^-^1 SpUtum preparations 



rabbit, showing capsules. Stained by Rd. ^■]^g capSulc of both pneumO- 



Muir's method, x 1000. , ■ i , 



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 



p 



