XL] 



BACILLUS : PATHOGENIC FORMS. 



113 



formation has set in. Under the most favourable conditions, 

 each cubical or rod-shaped mass of protoplasm includes one 

 spore, in which case the bacillar filament contains an almost un- 

 broken row of spores ; but in other cases only an elementary 

 mass here and there contains a spore, the rest breaking down 

 and becoming absorbed. In the first case also, the protoplasm 

 of the elements almost entirely disappears, the sheath swelling 

 up and becoming hyaline, and only the bright spores remain- 

 ing. Their linear arrangement, however, still indicates that 

 they were formerly contained in one filament. 



Fia. fO. FROM AN ARTIFICIAL CULTURE IN NEUTRAL roRK-Bnom OP 



BACILLUS ANTHRACIS, WITH COPIOUS FORMATION OF SPORES. 



Magnifying power 700. (Stained with Seller's purple.) 



If bacil'li grow in the depth of a fluid medium, they do not 

 form spores, as has been stated above ; and as we have also 

 seen, as new bacilli appear, or the old filaments increase in 

 length, degeneration sets in. This degeneration gradually 



