SUMMARY 255 



Species 7. Sir. gracilis (Escherich) Lehmann 

 and Neumann. 



Small coccus occurring in chains. Ferments lactose 

 and coagulates milk. May ferment salicin and mannite. 

 Liquefies gelatin, actively. 



Genus IV. Aurococcus Winslow and Rogers. 



Parasites. Cells in groups and short chains, very rarely 

 in packets. Generally stain by Gram. On agar streak 

 good growth, of orange color. Sugars fermented with 

 formation of moderate amount of acid. Gelatin often 

 liquefied very actively. May or may not reduce nitrates. 



Species i. Aur. aureus (Rosenbach) Winslow. 



A parasitic coccus, living normally on the surface of the 

 human or animal body, or in diseased tissues. Occurs 

 singly, or in pairs, or irregular groups, rarely in short chains. 

 Generally stains by Gram. Good to abundant surface 

 growth, of orange color. Moderate acid production in 

 dextrose and lactose broth. Nitrates not reduced. 

 Growth good at both 20 degrees and 37 degrees, but pig- 

 ment production much better at 20 degrees. Gelatin 

 liquefied rapidly. 



Species 2. Aur. aurantiacus (Schroter, Cohn) 

 Winslow. 



A parasitic coccus, living normally on the surfaces of the 

 human or animal body, or in diseased tissues. Occurs 



