MICROCOCCI 493 



MICROCOCCUS CANDIDUS 



Authority. Cohn, Beitragc zur Biologie der Pflamen, vol. i., Heft. ii. r 

 1870, p. 160. 



Where Found. Included by Lustig amongst bacteria found in water. 



Microscopic Appearance. Small round refracting cocci from 0-5 to 0-7 /* in 

 diameter. Forms zoogloea. It is not motile. 



Cultures. 



GELATINE PLATES. Forms at first small circular white heaps, which later 

 become irregular in shape, having a convex surface. Under a low power the 

 contents appear granular. 



GELATINE TUBES. Grows chiefly on the surface and is hardly visible in 

 the depth. No liquefaction takes place. 



AGAR-AGAR. Kesembles the growth in gelatine tubes. 



Remarks. It grows in solutions of sugar, but excites no fermentation (Adametz). 



MICROCOCCUS CEREUS ALBUS 



Authority. Passet, ' Ueber Mikroorganismen der eitrigen Zellgewebsent- 

 ziindung des Menschen,' Fortschrittc d. Meclicin, 1885, No. 2. 



"Where Found. In pus by Passet, and by Tils (Zoc. cit.) in water. It occurs 

 also in the air. 



Microscopic Appearance. Large cocci 1-16 /u in diameter ; occurs singly, 

 but also in groups, and occasionally in chains. It is not motile. 



Cultures. 



GELATINE PLATES. Forms white dots which extend on the surface to from 

 1 to 2 mm. They resemble drops of stearin or white wax, being faintly shining. 



GELATINE TUBES. Grows slowly in the depth, forming a grey white streak, 

 and produces on the surface a white waxlike expansion with a thickened 

 irregular periphery. No liquefaction ensues. 



AGAR-AGAR. Forms a fairly thick grey white faintly shining expansion. 



POTATOES. Forms a fairly thick grey white expansion. 



BLOOD SERUM. Forms a greyish white faintly shining streak in the depth. 



MICROCOCCUS AEROGENES 



| LIQUEFIES GELATINE 



Authority. Miller, Deutsche medicinische Woclienschrift, 1886, No. 8. 



Where Found. In the alimentary canal. In water by Tils (Zoc. cit.). 



Microscopic Appearance. Large oval cocci. Not motile. 



Cultures. 



GELATINE PLATES. Forms chiefly circular colonies of a grey white colour, 

 the periphery of which is somewhat lobular, but smooth. Characteristic 

 marbled spots are visible, which look light or dark according to the position of 

 the microscope. 



GELATINE TUBES. Forms a flat, grey white, button-shaped growth on the 

 surface, whilst all along the needle's track in the depth a brownish yellow growth 

 appears. After a time slight liquefaction commences. 



AGAR-AGAR. Produces a yellowish white mash-like expansion. 



POTATOES. Gives rise to a slimy, grey white expansion, with an irregular 

 and lobular periphery. 



Remarks. It is very resistant to the action of acids, and will maintain its vitality 

 for hours in artificially prepared gastric juice. In substances containing carbohy- 

 drate it produces a considerable amount of gas. 



