DESCRIPTION OF SPECIES. 



537 



nucleus and transparent marginal 

 zone. 



Inoculated in the depth of gela- 

 tine there is a slight growth in the 

 track of the needle, and after a time 

 liquefaction at the upper part. 



On agar the growth is smooth and 

 shining. 



In broth they produce turbidity. 



They will not grow on potato. 



They occur in sewage. 



Bacillus tenuis sputigenus 

 (Pansini). — Short rods, singly, and 

 in pairs ; capsulated. 



They produce a whitish growth 

 on the surface of gelatine. 



They coagulate milk. 



_They are pathogenic in rabbits. 



They were isolated from sputum. 



Bacillus termo (Mac^).— Thick 

 rods 1'4 n long, and -8 fi wide, 

 usually in pairs, sometimes in chains. 

 Actively motile. 



Colonies whitish, with a grey edge 

 surrounded by liquefied gelatine. 



Inoculated in the depth of gela- 

 tine they form a funnel-shaped 

 area of liquefaction, and later the 

 whole of the jelly is liquefied. 



Broth is rendered turbid and a 

 thin brittle pellicle is formed. 



They are associated with decom- 

 position. 



Bacillus tetani (p. 457). 



Bacillus thalassopMlus (Bus- 

 sel). — Slender rods varying in 

 length ; and filaments. They are 

 anaerobic. Spore-formation pre- 



culated in the depth of gela- 

 tine the growth appears in the 

 lower part of the track of the 

 needl^4o the form of cloudy colo- 

 nies, liquefying the jelly and pro- 

 ducing gas-bubbles. Cultures emit 

 a penetrating odour. 



They were isolated from sea-mud. 



Bacillus thermophilus (Mi- 

 quel). — Rods varying in size accord- 

 ing to the temperature at which 

 they are cultivated. In broth thfey 

 grow best between 65° and 70° C, 

 forming a copious deposit. They 

 occur in air, soil, and water. 



Bacillus tremelloides (Tils).— 

 Rods -75 to 1 ju in length, -25 /i in 

 width ; and in masses. , 



Colonies circular, yellowish- 

 brown. 



The bacilli inoculated in thei 

 depth of gelatine produce a growth 

 composed of isolated yellow colo- 

 nies in the track of the needle, 

 and a yellow mass on the surface. 

 They liquefy the gelatine. 



On agar the growth is slimy and 

 golden-yellow. 



On potato they form an abund- 

 ant yellow growth. 



They occur in water. 



Bacillus tuberculosis (p. 378). 



Bacillus tuberculosis galli- 

 narum (p. 402). 



Bacillus tumesoens (Zopf).— 

 Cocci, long and short rods. They 

 form a jelly-like disc -6 to 1 cm. in 

 diam. on slices of boiled carrot, 

 with the appearance of a rather 

 tough, crumpled skin of a whitish 

 colour. Examination of this pel- 

 licle shows that it is formed of 

 rows of rods lying closely together. 

 These rods can be observed to 

 divide into short rods and coeci. 

 Spore-formation occurs in two 

 stages of development — viz., in the 

 cocci and in the short rods. A 

 cultivation is obtained by exposing 

 slices of boiled carrot, slightly 

 moistened, to the air at the tem- 

 perature of the room. 



Bacillus typhi abdominalis 

 (p. 342). 



Bacillus ubiquitus (Jordan). — 

 Rods I'l to 2 fi in length, "l fn 

 in width ; and filaments. 



Colonies granular and well 

 defined. 



The bacilli inoculated in the 

 depth of gelatine produce a growth 

 resembling that of Priedlander's 

 pneumoooccus. 



On agar and potato the growth 

 is greyish-white. 



They coagulate milk and reduce 

 nitrates. 



They occur in air and water. 



Probably a variety of Bacillus 

 candioans. 



Bacillus ulna (Cohn),— Cocci, 

 short rods, long rods, and threads. 

 Diam. of the cocci ]'5 to 2'2 ft. 

 Spore-formation in both short and 

 long rods. No septic odour is pro- 



