142 



BACTERIOLOGY. 



of Koch of the same age. They have the faintest 

 yellowish-brown tinge, a well-defined border, and a 

 distinctly granular appearance. They liquefy nutrient 

 gelatine very rapidly, so that the first plate of a 

 series is, as a rule, completely liquefied on the day 



following inoculation, 

 and the second plate 

 in two or three days 

 more. In a test-tube- 

 cultivation in nutrient 

 gelatine the appear- 

 ances are especially 

 characteristic ; the ge- 

 latine is very rapidly 

 liquefied along the 

 whole track of the 

 needle, so that the 

 cultivation resembles a 

 conical sack, or the 

 finger of a glove 

 turned inside out (Figs. 

 35 and 36). On a 

 Fig . 35 . rig. 3 6. sloping surface of nu- 



PURE CULTIVATIONS OF THE SPIRILLUM tnent agar-agar a white 



FINKLERII IN GELATINE- BPTONE- m ^t plaque forms Very 

 In twenty-four hours. quickly. On potatoes 



they grow at the ordi- 

 nary temperature of the air, producing a brownish 

 layer, and corrosion of the surface of the potato. 

 They were discovered in the evacuations of cases 



Fig. 35- An 

 Fig. 36. In 



