SPECIES DESCRIBED BY VARIOUS WRITERS. 199 



no smell is detected from a cultivation in milk. 

 Inoculated into mice and guinea-pig's abscesses 

 are produced or death from septicaemia results. 

 They are occasionally present in pus. 



Bacterium termo, Dujardin. Short cylindrical 

 or oblong cells, 1-5 p long, -5 7 broad, generally 

 occurring as dumb-bells. The cells have dark 

 contents, invested by a thick membrane, and are 

 provided with flagella, to which the characteristic 

 movements are due (Plate I., Fig. 8). They are the 

 cause of putrefaction, and invariably appear in de- 

 composing albuminous substances and liquids. A 

 growth can be readily started by placing a piece of 

 meat in water in a warm place. Cultivated in broth, 

 they produce a turbidity, and on sterilised potatoes, a 

 slimy grey layer. (Compare Bacterium ceruginosum) . 



Bacterium lineola. Cells 3-8 /x 5-2 ^ long, 

 1*5 /u, wide. They occur singly or in pairs, occa- 

 sionally in zooglcea, but never in chains. The cells 

 are provided with flagella, and contain strongly 

 refringent contents. They resemble Bacterium 

 termo in form and in movement, but are consider- 

 ably larger. They occur in well water and stagnant 

 water, and form slimy heaps on rotting potatoes, 

 and zooglcea and pellicles on various infusions. 

 Cultivated on nutrient agar-agar they form a semi- 

 transparent growth (Plate XXIV., Fig. i). 



Bacterium lactis. Cells* about 1*5 3 ^ long. 

 They are constricted in the middle, and arranged 



* Pasteur. 



