X.] 



BACILLUS. 



in 



and 0*002 mm. thick. They are motile, just like bacillus 

 subtilis. Although they form chains they do not form proper 

 leptothrix. They occur in putrid fluid. They are very 

 common in the ichor produced by injecting ammonia or other 

 substances producing sloughing and necrosis of the subcu- 

 taneous tissue in the guinea-pig. 



FIG. 47. BACILLUS ULNA, IN THE CAPILLARIES OF THE HUMAN LIVER. 

 POST-MORTEM CHANGE. 



1. Liver cells, somewhat swollen. 



2. Bacilli. 



Magnifying power 300. 



(c) bacillus septicus occurs in earth, in putrid blood, and 

 in many putrid albuminous fluids. It is non-motile, and is 

 capable of forming leptothrix. The thickness varies from 

 o'oo4 to o-oi mm., and its length depends on the number 

 of elements contained in a row. The shortest are about 0*004 

 mm. There are various species, differing from one another 

 in the thickness of the elements. They are all anaerobic. 

 The elements, whether in the short rods or in the leptothrix 

 filaments, are cubical or rounded. The rods and filaments 

 are markedly rounded on the ends. It forms spores 



