DESCRIPTION OF SPECIES. 



553 



In the depth of gelatine the 

 growth is very scanty. 



On the surface of agar the growth 

 is yellowish. 



On potato the growth is similar 

 but more abundant. 



Micrococcus concentricus 

 (Zimmermann). Cocci -9/zin diam., 

 in masses. 



Colonies bluish-grey. 



Inoculated in the depth of gela- 

 tine there is no growth in the track 

 of the needle, but concentric rings 

 form on the free surface. 



On agar the growth is greyish- 

 white and smooth. 



On potato yellowish and slimy. 



They occur in water. 



Micrococcus cremoides (Zim- 

 mermann). -Cocci '8 /z in diam., 

 occurring in masses. 



Colonies are spherical, granular 

 and yellowish. The margins are 

 dentated or irregular, and processes 

 extend into the surround ing gelatine. 



Inoculated in the depth of gela- 

 tine liquefaction occurs in the 

 track of the needle in a few days. 

 A yellow growth floats on the 

 liquefied gelatine, and a yellowish 

 mass subsides to the bottom of the 

 liquid. 



On agar a smooth shining layer 

 is formed, and on potato the growth 

 is abundant. 



They occur in water. 



Micrococcus crepusculum 

 (Cohn. Monas crepusculum, Ehren- 

 berg. Jfikrokokken in faulenden 

 Substraten, Fliigge). Round or 

 short oval cells, scarcely 2 //, in 

 diam. ; singly or in zoogloea. 



They occur in various infusions 

 and putrefying fluids in company 

 with Bacterium termo. 



Micrococcus cumulatus tenuis 

 (Besser). Large cocci, oval ; in 



Colonies on agar have a brown 

 nucleus. 



Inoculated in the depth of gela- 

 tine they form a white filament, 

 and on the surface a transparent 

 layer. 



In broth there is an abundant 

 deposit, and the supernatant liquid 

 is clear. 



They occur in mucus from the 

 nose. 



Micrococcus endocarditidis ru- 

 gatus (Weichselbaum). Cocci re- 

 sembling pyogenic staphylococci. 



Colonies have a brown or yellow- 

 ish-brown nucleus. 



In the depth of agar there is a 

 slight growth in the track of the 

 needle, and a wrinkled, waxy layer 

 on the surface. 



On potato the growth is dry and 

 brownish. 



On blood serum the growth is 

 colourless and adherent. 



In jectedsubcutaneously, they pro- 

 duce, in rabbits, local swelling and 

 redness, and suppuration in guinea- 

 pigs. Injected into the veins after 

 injury to the aortic valves, they 

 produce endocarditis. 



They were isolated from a case 

 of ulcerative endocarditis. 



Micrococcus fervidosus (Ada- 

 metz). Cocci '6 /A in diam., in pairs 

 and in masses. 



The deep colonies are pale-yellow, 

 and look like watery droplets ; but 

 superficial colonies are granular and 

 irregular with jagged edges. 



Inoculated in the depth of gela- 

 tine a granular filament develops in 

 the track of the needle, and on the 

 surface a circular patch with den- 

 tated margin. 



On agar the growth is white and 

 slimy, and on potato greyish - 

 white. 



They occur in water. 



Micrococcus Finlayensis 

 (Sternberg). Cocci '5 to '1 p. in 

 diam., singly, in pairs, tetrads, and 

 in masses. 



In the depth of gelatine they 

 produce a growth in the track of 

 the needle, with liquefaction at 

 the upper part with a pale-yellow 

 deposit. 



On agar the growth is pale-yellow. 



They were isolated from the liver 

 in a fatal case of yellow fever. 



Micrococcus flavus desidens 

 (Fliigge). Cocci singly, in pairs, 

 or chains of a few elements. 



Colonies yellowish-white. 



Inoculated in the depth of gela- 

 tine they grow along the track of 



