STAPHYLOCOCCUS PYOGENES AUREUS 55 



coccus Pyogenes Aureus, and white in that of 

 Staphylococcus Pyogenes Albus. 



Similar growths occur on gelatine, but the medium 

 is rather rapidly liquefied, and the character lost. 

 A stab-culture of Pyogenes Aureus in gelatine is 

 shown in Fig. 47, and appears as a funnel-shaped 

 depression of liquefied gelatine rendered turbid by 

 the suspended growth. The funnel is fairly wide, 

 and slopes regularly and not rapidly from the top 

 to the bottom of the culture. In time the whole 

 tube would be liquefied. In cover-glass pre- 

 parations the organism is shown in Fig. 48, and 

 appears as a congeries of equal-sized spherical 

 cells, showing a tendency to arrange themselves as 

 diplococci. It is as diplococci that they generally 

 appear when examined without staining in drop 

 culture, while tetrads and short chains are not 

 uncommon. 



These organisms, like the streptococcus, vary 

 considerably in their virulence, but form cultures 

 which are much more copious and possessed of 

 much greater vitality, so that sub-culture is 

 easy. 



The staphylococci in subcutaneous injection or 

 inunction (even with intact skin) give rise to local 

 suppuration but not to inflammation of the ery- 



