NOX-PATHOGENIC BACILLI. G87 



E. Strictly Anaerobic Bacilli. 



401. BACILLUS MUSCOIDES (Liborius). 



Found in the soil by inoculations in mice, also in old cheese, and in the 

 excrement of cattle. 



Morphology. Bacilli about 1 ju thick, with slight inclination to form fila- 

 ments. 



Biological Characters. An anaerobic, non-liquefying, motile bacillus. 

 Forms short-oval spores, which are located at the ends of the rods. In gela- 

 tin and in agar forms colonies which give off delicate, branching, moss-like 

 offshoots. In gelatin stick cultures a delicate, branching growth is given 

 off from the lower two-thirds of the line of puncture. 



FIG. 229. Bacillus muscoides; colony in nutrient gelatin, x 80. (Liborius.) 



402. BACILLUS SOLIDUS (Luderitz). 



Obtained from garden earth by inoculation into mice and guinea-pigs. 



Morphology. Bacilli of from 1 to 10 n in length average 4 5 ju and 

 0. 5 n thick ; the longer bacilli consist of two segments, but regular filaments 

 are not formed. 



Biological Characters. An anaerobic, non-liquefying, motile bacillus. 

 Movements tolerably active, pendulous and progressive. In old gelatin 

 cultures some of the bacilli contain, at one or both ends, small refractive 

 bodies which are probably spores. Grows at the room temperature. In 

 nutrient gelatin containing grape sugar, at the end of two days, punctiform 

 colonies are developed which later attain the size of a poppy seed ; they are 

 spherical and have smooth outlines; the gelatin is not liquefied, but gas bub- 

 bles are formed, and a disagreeable odor is given off by the cultures, resem- 

 bling decomposing perspiration from the feet. In the absence of grape 

 sugar the development is scanty and there is no development of gas. In 

 nutrient agar the colonies are but little larger, they are transparent, and 

 under a low power resemble little flocculi of cotton. In blood serum devel- 

 opment occurs only in the middle and lower part of the line of puncture. 



