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. Tprula-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 bitty ricum, ferment butyrique, Pasteur). This bacillus 



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

 Boianique, vol. xxiv. 1877. 



