THE CLASSIFICATION OF BACTERIA 199 



215. Bact. terrae (Ucke) 



Streptotadllus terra Ucke: Centralblatt f. Bakteriol., XXIII, 1898, looi. 



Morphology. Bacilli 2.0 : 6-20 ;«,, and longer chains. Polar oval spores. 



Stained by Gram's method. 

 Gelatin. No growth at 22°. 



Bouillon. A flocculent white sediment ; a stronger growth in glucose bouillon. 

 Agar slant. Growth white, very scanty, limited, with finely erose border. 

 Agar stab. In depth, growth scanty, filiform. 

 Milk. Not coagulated. 

 Potato. No visible growth. No gas. No odor. Litmus reduced. An acid 



production in saccharine media. 

 Blood serum. Small, flat, yellowish colonies. 

 Habitat. Isolated from the soil. 



•II. Rods becoming latterly swollen or spindle-shaped at sporulation. 



216. Bact. parvum 



B. liquefaciens-parvus Luderifz : Zeitsch. f. Hygiene, V, 1889, 149. 



Morphology. Bacilli 0.5-0.7: 2-5 /ii; filaments, often bent. Spore formation 

 not distinct, but small round refractive bodies in the greatly thickened 

 rods. 



Gelatin colonies. Entire, becoming tuberculate with delicate outgrowths. 

 Liquefaction of gelatin slow ; but little gas. 



Habitat. Soil. 



BACILLUS Cohn, char, emend by Migula 



Cells cylindrical, varying from short ovals to longer rods and filaments. Mo- 

 tile, with flagella attached to any part of the rod, varying from a few to 

 numerous, and surrounding the entire body of the bacillus (peritrichic). 

 Endospores present or absent, or at least in a large number of the species 

 unknown. 



Note. — Our imperfect knowledge of the great majority of the described species of 

 bacteria, especially as regards the nature of their flagella, makes it impossible to properly 

 classify many of them. 



Those species which are known to possess peritrichic flagella belong properly to this 

 genus, and are designated by a large B in black-faced type before each specific name. 

 Those doubtfully placed in the genus are all so-called motile forms whose flagella are not 

 described, and are designated by a B in plain type. 



The author has therefore made this group the great lumber room into which are thrown 

 all indefinitely motile forms. It is likely that many of the species here included, although 



