ii4 MICRO-ORGANISMS AND DISEASE. [CHAP. 



series of short cylindrical elements. There are a number 

 of species varying from one another in the thickness of the 

 threads. 



FIG. 50. THREADS OF CLADOTHRIX DICHOTOMA HIGHLY MAGNIFIED AND 

 STAINED WITH SPILLER's PURPLE. 



1. Threads of bacilli. 



2. Torula-forms. 



The sheath is everywhere well seen. 



Zymogenic bacilli. 



Amongst these there is one species definitely known, 

 namely the Bacillus butyricus (Bacillus amylobacter^ Clos- 

 tridium butyricum, ferment butyrique, Pasteur). This bacillus 



1 Prazmowski, Leipzig, 1880 ; van Tieghem, Bulletin de la Societe 

 Botanique, vol. xxiv. 1877. 



