DESCRIPTION OF SPECIES. 



509 



Colonies circular, bluish-green, 

 with a granular nucleus and delicate 

 irregular periphery. 



In the depth of gelatine there is 

 scarcely any growth in the track of 

 the needle, but a shining greenish- 

 yellow film on the surface, and 

 liquefaction below it. 



On agar the growth is faintly 

 yellow. 



In broth they produce turbidity 

 and a yellowish deposit. 



On potato the growth is yellow- 

 ish. 



They occur in earth. 



Bacillus diphtheriae (p. 332). 



Bacillus diphtheriae colum- 

 barum (p. 336). 



Bacillus dysodes(Zopf). Cocci, 

 long and short rods, and spores. 



They were observed in bread, 

 making it greasy and unfit for food, 

 and generating a penetrating odour 

 resembling a mixture of pepper- 

 mint and turpentine. A great loss 

 may result to bakers if the fungus 

 is introduced with the yeast. 



Bacillus endocarditidis cap- 

 sulatus (Weichselbaum). Cocci 

 resembling Fried lander's pneumo- 

 cocci. 



Colonies faintly yellow, with 

 dentated contours. 



In the depth of gelatine the 

 growth produces a filament in the 

 track of the needle, and a patch like 

 stearin on the free surface. 



Large doses injected subcutane- 

 ously, or into the peritoneal cavity 

 prove fatal to rabbits. 



They were isolated from infarcts 

 in a fatal case of endocarditis. 



Bacillus endocarditidis griseus. 

 Rods motile. 



Colonies granular and brown or 

 yellowish-brown. 



In the depth of gelatine there is 

 a filamentous growth in the track 

 of the needle, and a circular whit- 

 ish patch on the surface. On agar 

 and potato the growth is greyish- 

 brown. 



Cultures cause a fatal result in 

 mice and guinea-pigs. 



They were isolated from a case of 

 endocarditis. 



Bacillus enteritidis (p. 372). 



Bacillus epidermidis (Bordoni 

 Uffreduzzi). Rods 2-8 to 3 /i in 

 length, and -3 \i in breadth. Spore- 

 formation occurs at 25 C. 



They grow very sparingly on 

 gelatine. 



On agar there is a surface growth. 



On potato at 15 to 20 C. the 

 growth appears first in the form 

 of drops, which gradually extend 

 and coalesce and form a thin layer 



i-NN . 



! FIG. 201. PURE CULTIVATION OF BA- 

 CILLUS FHJUKAXS ON THE SURFACE 

 OF NUTRIENT AGAR-AGAR. 



I over the surface. On blood serum 

 they form a thin film. 



Inoculation in rabbits and guinea- 

 i pigs and on the human skin pro- 

 | duced no result. 



They were isolated from flakes 

 of cuticle from between the toes. 



Bacillus erysipelatis suis (p. 

 356). 



Bacillus erythrosporus 

 i (Eidam). Slender rods and 



