SYSTEMATIC AND DESCRIPTIVE. 127 



organs examined, masses of cocci were observed 

 enclosing blood corpuscles. Fresh inoculations in 

 rabbits with exudation-fluid, or blood from the heart, 

 reproduced the same disease. 



Micrococcus of progressive suppuration in 

 rabbits, Koch.* Cocci only about "15 ^ in diam., 

 principally in thick zoogloea. The disease was 

 induced by the injection into rabbits of decom- 

 posing blood. At the place of injection a spread- 

 ing abscess formed, which was fatal to the animal in 

 about twelve days. No bacteria were observed in 

 the blood, but in the walls of the abscess thick 

 masses of cocci were found. The pus is infectious, 

 causing the same disease in healthy rabbits. 



Micrococcus aurantiacus, Schroter. 

 Cocci, oval, i '5 JJL in diam., singly or in pairs, or in 

 zooglcea. They occur as orange-yellow spots which 

 coalesce into patches. A golden-yellow pellicle 

 develops when they are cultivated in nutrient liquids. 

 The colouring matter is soluble in water. They 

 were observed on boiled potatoes and white of egg. 



Micrococcus chlorinus, Cohn. Cocci occur 

 in the form of a finely granular zoogloea, causing 

 a yellowish green or sap-green layer on boiled 

 eggs and nourishing solutions. The colouring 

 matter is soluble in water and is decolorised by 

 acids. 



Micrococcus violaceus, Schroter. Cocci 

 elliptical, larger than M. prodigiosus, uniting into 



* Koch, Wundinfect. Krankheit, 1878. 



