SAPROPHYTIC MICROCOCCI. 225 



Micrococcus fulvus. Spherical cells 1'5 ju. in diameter, 

 frequently united in pairs, with tough intercellular sub- 

 stance. Form rusty red drops of firm consistence and about 

 5 mm. in diameter on horse dung (Cohn, Beitrage, Bd. 1. 

 Hft. 3). 



To the pigment-producing micrococci belong also 



Micrococcus Juzmatoides. 



Discovered by Babes as the cause of red sweat (sueur rouge). Micrococcus 

 Micrococci 1 /j.. in length and 0'6 p. 0*8 fi. in breadth, united f re d sweat. 

 by a gelatinous zooglaea mass of a uniform red colour. These 

 zooglaea masses surround the hairs on those parts of the body 

 where the red sweat is formed, e.g., the axilla. The cocci 

 can be stained by Gram's method; they grow on white of 

 egg at 37 C., and here also produce the red colouring matter, 

 which has similar reactions to that formed by Bacillus 

 prodigiosus. 



Sarcina lutea.* 



Bound cells more than 1 P. in size, which divide in Yellow 

 three axes ; the daughter cells remain united together, s 

 and thus packet-like colonies are formed resembling 

 corded bales of goods ; these again may be united 

 together in larger packets. When sown on gelatine 



& 



Fig. 59. Sarcina X 600. Fig. 60. Sarcina X 650. 



Drawn as if lying in one plane. Diagrammatic picture. 



plates the colonies form in two days yellow points which 

 lire just visible, and which under a low power present 

 the form of irregular plates in part lobate and furnished 

 with projections grey in colour but transparent towards 

 the margin. In punctures and strokes on gelatine, 

 agar, and slices of potato, a slowly growing yellow 

 confluent mass is formed. It is not uncommonly 

 obtained from the air as an accidental impurity. 



* Hygienic Laboratory at Gottingen. 



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