DESCRIPTION OF SPECIES. 



557 



different organs, especially in the 

 glomeruli of the kidneys. Rabbits 

 and mice inoculated with blood 

 from the heart proved susceptible 

 to the disease. 



Micrococcus in syphilis (Disse 

 and Taguchi). — Cocci and diplo- 

 cocci. 



They produce a greyish-white 

 growth in nutrient media. 



They are said to produce inflam- 

 matory changes in the internal 

 organs and disease of the blood- 

 vessels when inoculated in dogs, 

 rabbits and sheep. 



They were obtained from the 

 blood in cases of syphilis. 



Micrococcus in trachoma 

 (p. 190). 



Micrococcus in yellow fever 

 (p. 260). 



Micrococcus lactis viscosus 

 (Conn). — Cocci in pairs and chains. 



Colonies circular and granular. 



Inoculated in the depth of gela- 

 tine liquefaction begins at the upper 

 part of the needle track, and extends 

 until the gelatine is completely 

 liquefied. The liquefied gelatine is 

 viscous, and may. be drawn out in 

 long threads. 



On the surface of agar they form 

 a white, shining layer. 



In broth there is an abundant 

 growth, and a film on the surface. 



They coagulate milk, producing 

 butyric acid, and giving it a bitter 

 taste. They were obtained from 

 bitter cream. 



Micrococcus luteus (Cohn).— 

 Oval cocci 1 to 12 fi, in diam. 



Colonies yellow, with irregular 

 contours, and granular. 



Inoculated in the depth of gela- 

 tine a granular filament develops in 

 the track of the needle, and on the 

 free surface a yellow patch. 



On agar the growth is slimy and 

 yellow. 



On potato the growth is yellow, 

 and after a time wrinkled. 



The pigment is insoluble in water, 

 ether and alcohol, and not destroyed 

 by acids or alkalies. 



They occur in water. 



Micrococcus luteus (Schroter). 

 — Cocci similar in size to the above, 



elliptical, with highly refractive cell 

 contents. 



They form yellow drops of 1 to 

 3 mm. diam. on boiled potato ; and 

 a thick, wrinkled, yellow skin on 

 nutrient liquids. 



The colouring-matter is insoluble 

 in water, and unchanged by sul- 

 phuric acid or alkalies. 



Micrococcus ochroleucus 

 (Prove). — Cocci '6 to "8 fi. in diam., 

 singly, in pairs, and short chains. 



Colonies minute and colourless, 

 with crenated margin, from which, 

 later, processes extend into the gela- 

 tine, while the centre of the colony 

 becomes yellow. 



On the surface of gelatine a film 

 develops, which in a few days turns 

 yellow. Old cultures have a pecu- 

 liar smell. 



The yellow pigment can be ex- 

 tracted with alcohol. It is insoluble 

 in water, and decolorised by acids. 



They were obtained from human 

 urine. 



Micrococcus of Forbes (p. 

 472). 



Micrococcus plumosus (Brauti- 

 gam). — Cocci S fj. in diam., in 

 masses. 



Colonies yeUowish-white. 



Inoculated in the depth of gela- 

 tine long delicate acicular processes 

 shoot out from the needle track 

 and on the free surface. 



On potato the growth is similar. 



They were isolated from water. 



Micrococcus pneumoniae crou- 

 posse (p. 236). 



Micrococcus pyogenes tenuis 

 (Rosenbach) . — Cocci irregular, 

 somewhat larger than staphylococci, 

 and with much less tendency to 

 form masses. The ends colour 

 deeply, leaving a clear space in the 

 middle. 



Inoculated in the depth of gela- 

 tine a slightly opaque growth is 

 formed. 



On agar a thin deposit appears 

 along the needle track, which is 

 almost as clear as glass. 



They occur in the pus of un- 

 opened abscesses, but not often, as 

 they were found by Rosenbach only 

 in three out of thirty-nine cases. 



