SPECIES DESCRIBED BY VARIOUS WRITERS. 1 97 



bedded in an abundant mucilage which is very 

 soluble in water. They have been described as 

 producing the so-called "fire blight" of the pear 

 tree and other plants. 



Micrococcus of mucoid fermentation, 

 Pasteur. Globular cells *2 /x, in diam., singly or 

 in chains. These and allied forms have been con- 

 sidered to be the cause of mucoid fermentation 

 in wine and beer * (vin filant, biere malade). 



Staphylococcus pyogenes citreus.f Cocci 

 singly or in pairs, or zooglcei. If cultivated on 

 nutrient gelatine or nutrient agar-agar, a sulphur 

 or lemon-yellow growth develops (Plate XXIV., 

 Fig. 3). When inoculated under the skin of mice, 

 guinea-pigs, or rabbits, an abscess forms after a 

 few days, from which a fresh cultivation of the 

 micro-organism can be obtained. They are 

 frequently present in pus. 



Staphylococcus cereus albus.f Cocci also 

 obtainable from pus, but distinguished by forming 

 on nutrient gelatine a white, slightly shining 

 layer, like drops of stearin or wax, with somewhat 

 thickened, irregular edge. The needle track 

 develops into a greyish -white, granular thread. 

 In plate cultivations, on the first day, white points 

 are observed, which spread themselves out on the 

 surface to spots of i 2 mm. When cultivated on 

 blood serum a greyish-white, slightly shining streak 



* Pasteur, Etudes sur le Vin ; sur la Biere. 1866 ; 1876. 



t Passet, Fortschritte der Medecin, Jan. i5th and Feb. ist, 1885. 



