574 



DESCRIPTION OF SPECIES. 



Urobacillus Preudenreichi 



(Miquel). — Rods 1 to 13 /i in width, 

 and filaments 5 to 6 /x in length. 



Colonies circular, white. 



Inoculated in the depth of gela- 

 tine growth occurs in the track of 

 the needle, and a pure white growth 

 on the surface, followed by slow 

 liquefaction. 



In broth they produce turbidity. 



They decompose urea. 



They occur in air, sewage and 

 dust. 



Urobacillus Maddoxi (Miquel). 

 — Rods 1 /x in width, 3 to 6 /i in 

 length, and involution forms. 



Inoculated in the depth of gela- 

 tine containing urea they produce 

 white colonies and crystals. 



In broth they produce turbidity. 



They decompose urea. 



They occur in sewage. 



Urobacillus Pasteuri (Miquel). 

 — Rods attaining 1'2 ^ in width, 

 and 4 to 6 /i in length, singly and 

 in pairs. Spore-formation present. 



They grow in ammoniacal gela- 

 tine, slowly liquefying it and form- 

 ing crystals. The liquefied gelatine 

 is viscid. 



They ferment urine, producing 

 a copious deposit of crystals. 



They were isolated from decom- 

 posing urine. 



Urobacillus Scliutzenbergi 

 (Miquel). — Short rods '5 /* in width, 

 1 /t in length. 



They rapidly liquefy gelatine. 



On agar they form a white layer. 



They grow readily in broth, 

 especially after the addition of 

 urea. The liquid is made cloudy, 

 but after a few days it becomes 

 clear again. 



They ocCur in water. 



Vibrio rugula (Miiller).— Rods 

 and threads, 6 to 16 fi long, about 

 •5 to 2-6 fi thick. The rods are 

 either simply bowed, or possessed 

 of one shallow spiral (Fig. 230). 



They bear a flagellum at each end. 

 The rods form swarms when caus- 

 ing decomposition, and then, or 

 after, grow out into threads, curved 

 in a screw-like manner. In the 



Fig. 230.— Vibkio Kugula, x 1020. 

 A. Bowed threads. B. Slightly- 

 curved rods. C. Rods swollen pre- 

 paratory to spore-formation. D. 

 Rods swollen at the spore-forming 

 end. E. Various, stages of the 

 developing spores. (Prazmowski.) 



next stage of development; the rods 

 cease to move, and become swollen 

 with granular contents. One ex- 

 tremity develops an enlargement, 

 giving the rod the appearance of 

 a pin. The spore formed by 

 the contraction of the plasma in 

 the swollen end finally becomes 

 globular. 



The vibrios appear in vegetable 

 infusions, causing fermentation of 

 cellulose. 



