80 MICRO-ORGANISMS AND DISEASE. [CHAP. 



Zymogenic bacilli. 



Amongst these there is one species definitely known, namely, 

 the Bacillus butyricus (Bacillus amylobacter, 1 Clostridium buty- 

 ricum, ferment butyrique, Pasteur). This bacillus has the same 



FIQ. 45. 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. 



morphological characters as regards length and thickness of 

 the rods, as regards power to form leptothrix, and as regards 

 motility, as the bacillus subtilis. It is capable of forming 



1 Prazmowski, Leipzig, 1880 ; van Tieghem, Bull, de la Soc.botanique, vol. 

 xxiv. 1877. 



