16 



THE OEGANISM IS A MICROCOCCUS. 

 THE GELATINE IS SLOWLY LIQUEFIED. 

 THE COLONIES ARE YELLOW. 



Micrococcus flavus desidens (Pliigge), from air and water ; small 

 cocci, in pairs or chains ; forms smaU yellowish-brown colonies, 

 surrounded by a depression of liq^uefled gelatine. 



Micrococcus radiatus (FHigge), from air and water; cocci 0"8 to 1 ;« 

 in diameter ; colonies form a radiating growth of a yellowish- 

 brown colour. 



Micrococcus aerogenes (Miller), from the alimentary canal; large 

 oval cocci, growing in flat yellowish- white colonies. 



Diplococcus luteus (Adametz), from water ; cocci in pairs, 1 to 1'2 /i in 

 diameter, sometimes in chains of eight or ten elements ; an 

 actively motile coccus. 



Diplococcus flavus lic[uefaciens tardus (Unna), from the skin in 

 eczema seborrhceicum ; biscuit- shaped diplococoi, resembling 

 the gonococcus, each element 0"5 to 0'8 /t in diameter ; colonies 

 form small circular yellow discs. 



Diplococcus subflavus (Bumm), from vaginal secretion and lochial 

 discharge ; biscuit-shaped diplococci, the cells from 0'5 to 1"5 fi in 

 diameter, resembling the gonococcus of Neisser ; stains with 

 the anUine colours and by Gram, this latter distinguishing it 

 from the micrococcus of gonorrhoea ; it liquefies blood serum. 



Diplococcus citreus conglomeratus (Bumm), from gonorrhoeal pus 

 and from the air ; resembles the gonococcus ; the colonies first 

 appear moist and shining, becoming cracked and scaly; the 

 cocci are about 1"5 ji in diameter, frequently arranged in tetrads. 



Sarcinse aurantiaca and lutea, from air and water; cocci in pairs, 

 tetrads, or packets, the cells of the S. lutea being the larger. 



Staphylococcus salivarius pyogenes,* from saliva ; when grown at 

 37° C, may be distinguished from Staphylococcus pyogenes 

 aureus by the liquefaction being slower, and the colour formed 

 being hghter ; stains well by Gram's method. 



* At ordinary temperatures the colonies of this organism are white, as 

 described on p. 11. 



