THE BIOLOGY OF MICROBES, ETC. 129 



the base of brain after death in cases of acute 

 cerebral meningitis. It occurs singly, as diplococci, 

 chains, and zoogloea ; and it grows on a mixture of 

 agar-agar and gelatine at the temperature of the 

 body. This microbe grows better at the surface 

 than in the deeper layers of the medium, and gives 

 rise to finely granular and yellowish-brown colonies. 

 The microbe, when cultivated artificially, only 

 remains virulent for six days ; and it is said that it 

 ' affects mice, guinea-pigs, rabbits, and dogs.' Like 

 M. gonorrhcece, this microbe 'is almost invariably 

 found within the cells contained in the exudation/ 



Micrococcus lomlycis. The cells are oval, and 

 measure 0'5 p in diameter. They occur singly, as 

 diplococci and chains, and produce the ' flacherie ' 

 or ' schlafsucht ' one of the silkworm diseases. 

 Another disease of the same larva is known 

 as ' pebrine ' ' maladie des corpuscules,' and is caused 

 by a microbe called Micrococcus ovatus, which 

 measures about 1*5 //, in diameter. M. ovatus is pre- 

 sent in large numbers in the blood and organs of 

 affected silkworms. 



Micrococcus of cattle -plague. Micrococci have 

 been found in the blood and lymphatic glands of 

 cattle dead of this disease. They occur singly, as 

 chains and zoogloea, and grow rapidly in bouillon and 

 other media at 37 C. Semmer and Archangelski * 

 have shown that calves inoculated from a pure cul- 

 tivation of this microbe died in seven days with all 

 the typical symptoms of cattle-plague or rinderpest. 



By successive cultivations, or by exposing culti- 

 1 Centralblatt fiir d. Mod. Wissensch., 1883. 

 I 



