554 



DESCBIPTION OF SPECIES. 



the needle, and form a yellowish- 

 brown layer at the point of punc- 

 ture. 



Later liquefaction sets in, and a 

 deposit forms at the bottom of the 

 turbid liquid. 



They occur in air and in water. 



Micrococcus flavus lique- 

 faciens (Fltigge). — Cocci mostly in 

 twos and threes, also in masses. 



Small yellow colonies appear after 

 two or three days, which have a 

 shallow depressed zone surrounding 

 them. Under a low power they 

 are granular and yellowish-brown, 

 with lines radiating from the centre 

 to the circumference. Later they 

 liquefy the gelatine, and coalesce. 



Inoculated in the depth of gelatine 

 the cocci produce spherical yellow 

 colonies in two days along the track 

 of the needle. These become con- 

 fluent, and at the end of eight days 

 the whole of the jelly has become 

 liquid ; later the upper part becomes 

 clear, and a yellow mass subsides to 

 the bottom of the tube. 



They occur in air and in water. 



Micrococcus flavus tardigra- 

 dus (Fliigge).— Large cocci showing 

 at times peculiar dark poles ; gener- 

 ally arranged in masses. 



Colonies develop slowly ; the 

 superficial ones have a smooth wax- 

 like surface with projecting centre ; 

 those below the surface are of a 

 dark chrome-yellow colour, and are 

 round or oval. 



Inoculated in gelatine the cocci 

 develop slowly along the track of 

 the needle, forming small isolated 

 colonies ; the gelatine is not 

 liquefied. 



They occur in air and in water. 



Micrococcus foetidus (Klamann). 

 — Cocci singly, in pairs, and short 

 chains and masses. 



Colonies circular or oval, white. 



Inoculated in the depth of gela- 

 tine a pure white, shining growth 

 forms in concentric circles at the 

 point of puncture, and develops a 

 brownish colour : and liquefaction 

 occurs after a time, and extends 

 along the needle track. 



A white layer spreads over the 

 surface of agar. 



On potato the growth is slimy 

 and grey in colour, with a red tinge. 



Cultures produce an odour like 

 that of ozsena. 



They were isolated from the 

 nose. 



Micrococcus foetidus (Eosen- 

 bach). — Small oval cocci. 



Cultivated in agar-agar they 

 develop gas-bubbles and a foetid 

 odour. They were isolated from 

 carious teeth. 



Micrococcus FreudeureicM 

 (Gruillebeau). — Large cocci, singly 

 and in chains. 



Colonies are granular and punoti- 

 form. 



In broth turbidity is produced, 

 and, later, a flocculent deposit. 



On potato a shining film develops, 

 yellowish or brownish-yellow in 

 colour. 



In milk the cultures become 

 viscous, and can be drawn out into 

 threads several yards in length. 



They were isolated from milk 

 with viscous fermentation. 



Micrococcus fascus (Masohek). 

 — Cocci oval. 



Colonies pale-brown or black. 



Inoculated in the depth of gela- 

 tine there is a slight growth along 

 the track of the needle, and a brown 

 layer forms on the surface followed 

 by liquefaction. 



On potato the growth is brown 

 or brownish-black and slimy. 



Cultures give off an odour of 

 putrefaction. 



They occur in water. 



Micrococcus gingivae pyogenes 

 (Miller). — Large cocci, smgly and 

 'in pairs. 



Colonies spherical, with sharp 

 contours. 



Inoculated in the depth of gela- 

 tine there is an abundant growth 

 along the track of the needle and 

 on the free surface. 



On agar a thick film develops, 

 with a faint tinge of purple by 

 transmitted light. 



Injected into mice subcutaneously 

 they produce local suppuration, and 

 sometimes death. Injected into 

 the peritoneal cavity they produce 

 peritonitis and death. 



