SYSTEMATIC AND DESCRIPTIVE. 169 



observed, especially in the north of Germany, during 

 the warm months ; and where milk is kept in hot 

 rooms, in the winter also. The bluing was origin- 

 ally attributed to a diseased condition of the cows, 

 or to their eating certain meadow plants. 



Bacillus acidi lactici. Long and short rods, 

 i 2'8 /A long, 34 ft thick, and thread forms; no 

 cocci; spore formation.* Cultivated on nutrient 

 gelatine the breadth of the rods is lessened. They 

 grow best between 35 and 42 C., and cease under 

 10 C. Cultivated at a temperature over 45*5, they 

 are no longer able to produce acidity. They are 

 not identical with a bacterium acidi lactici which has 

 been described. Probably several micro-organisms 

 are able to produce an acid reaction in milk. 



They occur with various other bacteria in sour 

 milk, and a pure cultivation, isolated by plate- 

 cultivations, turns sterilised milk sour. 



Bacillus cedematis maligni, Koch. (Pas- 

 teur's Septic ce mid). Rods from 3 3*5 //, long and 

 i n p, wide; they mostly lie in pairs, and then 

 appear to be double this length. The rods are 

 rounded at their ends, and form threads which are 

 sometimes straight, but more commonly curved. In 

 stained preparations they have a somewhat granular 

 appearance. The bacilli are distinguished from 

 anthrax bacilli by their being somewhat thinner, 

 by their rounded ends, and by their being motile. 

 Anthrax bacilli also never appear as threads in fresh 



* Hueppe, MittheiL a. d. Gesundheitsamt, Zweiter Band, p. 339. 



