498 MICRO-OEGANISMS IN WATER 



MICEOCOCCUS FUSCDS 



LIQUEFIES GELATINE 



Authority. — Maschek, Die Bakterien derNutz- tend Trinhwasser^ Adametz. 

 Vienna, 1888. 



Where Found. — In water. 



Microscopic Appearance. — Cocci often elliptical in shape and sometimes 

 difficult to distinguish from short bacilli. They are sometimes arranged in 

 torula form. Not motile. 



Cultures. — 



Gelatine Plates.— Forms circular colonies, which under a low power ap- 

 pear light brown or blackish iu colour. The interior of the colony consists of 

 fine crevasses. Liquefaction begins early, and a dark brown pigment is pro- 

 duced. 



Gelatine Tubes. — Hardly any growth appears in the depth ; on the surface 

 a sepia brown pellicle is formed, and the liquid gelatine emits a most penetrat- 

 ing and foul odour. 



Potatoes. — Forms a slimy, brown expansion, which becomes darker and 

 darker in colour. 



STAPHYLOCOCCUS PYOGENES AUEEUS 



LIQUEFIES GELATINE 



Authority. — Rosenbach, Mihroorganis'ine.n hei den Wundinfectionskrank- 

 heiten des Menschen, Wiesbaden, 1884 ; also Passet, ' Ueber Mikroorganismen 

 der eitrigen Zellgewebsentziindung des Menschen,' Fortschritte d. Med., 1885, 

 No. 2. See also A. E. Pick, Ueber Mikroorganismen ini Conjmictival Sack, 

 Wiesbaden, 1887. 



"Where Found. — Very frequently in pus ; also in air, soil and water. Found 

 in the conjunctival sac of the eye by A. E. Fick {loc. cit.). 



Microscopic Appearance. — Cocci of variable size arranged in heaps, and 

 also as diplococci, or in very short chains of three or four individuals. The 

 mean diameter of a single coccus is about 0-87 ju- It is not motile. Is readily 

 coloured by Gram's method. 



Cultures. — 



Gelatine Plates. — On the second day orange dot-shaped colonies are visible, 

 surrounded by a slight smooth-rimmed depression. 



Gelatine Tubes. — A cloudy grey streak first appears, which after three 

 days liquefies the gelatine, producing a yellow, but later an orange-coloured 

 growth, which sinks to the bottom. 



Agab-agah. — Forms a yellow and then orange-coloured expansion, with a 

 wavy periphery. 



Potatoes. —Produces a thin whitish expansion which gradually becomes 

 moister and orange yellow in colour. Emits a strong odour of paste. 



Blood Serum. — Grows as on agar-agar. 



Remarks.— Grows best at 30° to 37'' C. It can exist for a long time in the absence 

 of air (Rosenbach). It is pathogenic to animals according to the manner in which it is 

 introduced into the system. When injected into the abdominal cavity, mice, guinea- 

 pigs, and rabbits succumb after a few days. When subcutaneously introduced into 

 guinea-pigs and rabbits, abscesses are formed. When inoculated into the cornea, it 

 causes acute inflammation, which lasts generally for three weeks (A. E. Fick). 



