BACTERIOLOGY. 



This speck becomes gradually larger and 

 reaches its ultimate size at the expense of the 



Fig '15. Endogenous Spores and their Manner of Formation. 



A, in the first type the previously homogeneous protoplasm 

 becomes granular (a) gathers together in one place (b) and 

 finally (c) is wholly included in the spore. B, C, D, true bacilli 

 in which spore formation occurs without altering the shape of 

 the rod. B, B. subtilis ; C, anthrax bacillus. D, B. megathe- 

 rium. E, spindle-shaped or club-shaped rods, showing changes 

 of form preliminary to spore formation. In E, f, only one of two 

 ' adjacent cells has become spindle-shaped. In g it appears as 

 if two spores lay in a single cell ; as a rule, however (as in d), 

 such an appearance is in reality due to a close connection of 

 two cells. E are forms of Clostridium butyricum, Cl. polymyxa 

 (partly after PrazmowskiX F, Plectridium forms, a, Tetanus 

 bacteria ; b and c, Bacteria from putrefying fluids. G, spore 

 formation in the genus Vibrio (V. rugula) after Prazmowski. 

 H, endospores in Spirillum after van Tieghem ; a, b, Spirillum 

 amyliferum ; d,g, Sp. scrpcns (?) 



cell-protoplasm. In a colony of bacteria differ- 

 ent stages of spore-formation may be simul- 



