THE BIOLOGY OF MICROBES, ETC. 141 



lent material. The animals often do not die for 

 three or four days after the injection, and generally 

 exhibit nervous symptoms, sometimes ending in 

 paraplegia.' 



Bacterium indicum. Is an aerial microbe rod- 

 shaped with rounded ends. On nutrient agar-agar 

 it produces a scarlet-coloured growth, but after some 

 days the growth loses its bright colour, and becomes 

 purplish, like an old cultivation of Micrococcus pro- 

 digiosus. On gelatine this microbe liquefies the 

 medium, and colours it scarlet. It also grows well 

 on the surface of potatoes. 



Bacterium merismopedioides. Each rod measures 

 from 1 to 1 '5 //, in thickness. It was first observed 

 by Dr. Zopf in the river Panke, Berlin, and is said 

 to divide into long and short rods, and finally into 

 cocci. This microbe also exists in zooglean form. 1 



Bacterium Zopfii. This bacterium, which was dis- 

 covered by Kurth, measures from 2 to 5 p in length, 

 and from 0*7 to 1 p in breadth. It is motile, and 

 occurs in long threads. It grows on gelatine-plates, 

 developing into thread-like growths in about thirty- 

 six hours. This microbe was first isolated from the 

 intestine of fowls. 



Bacterium oxytocum perniciosum. First isolated 

 from sour milk. Each rod has rounded ends, and 

 forms yellowish colonies on gelatine plates. Needle 

 cultures have the characteristic nail appearance. 

 In milk this microbe produces curdling and an acid 

 reaction. It measures 1 /JL in length ; and in large 

 doses it is pathogenic in rabbits. 



1 Zopf, Die Spaltpilze (1885) ; and Die Pilze (1890). 



