ST.] 



BACILLUS : PATHOGENK 



OP 



>. 109 



thicker and rounded. Examined in preparation.- made after 

 the Weigert-Koch method (i.e. drying of a thin layer and 

 staining it with anilin dyes, washing in water, then in spirit, 

 then again in distilled water, and then drying and mounting 

 in Canada-balsam solution), all the bacilli and their filaments 

 are seen to be composed of a thin hyaline sheath, and in this 

 is a row of cubical or rod-shaped masses of protoplasm taking 

 the dye very readily. According to the length of the bacilli 

 the number of these elementary masses of protoplasm varies. 

 Some of the rod-shaped elements appear constricted in the 

 middle, preparatory to division. Between each two elements 

 is a fine septum. 



Fie. 77. FROM AN ARTIFICIAL Cn.TCRK OK E*OLT.rs A^THRACIS, CARRIF.D 

 ON AT ORDINARY TEMPERATURE AND ON SOLID (GELATINE) MATERIAL. 

 TORULA-FORM. 



Magnifying power 450. (Stained with Spiller's purple.) 



Bacilli anthracis when growing at ordinary temperatures on 

 a solid medium (e.g. a mixture of gelatine and broth, or Agar- 

 Agar and peptone) show a very peculiar modification, inasmuch 

 as some of the elements assume a spherical or oval shape, a 



