BACTERIOLOGY 



found which gives the surface the appearance of a drop of 

 stearine (fig. 76). On agar a layer spreads out from the 



_ Superficial Deposits at the site 

 deposit of inoculation 



Needle-track 



Needle-track 



Fia. 76. THRUST-CULTURE ix GELATINE 

 OF STAPHYLOCOCCUS CEREUS PLAVUS. 



FIG. 77. THRUST-CULTURE ix GELATINE 

 OF STREPTOCOCCUS PYOGEXES. 



streak, in the neighbourhood of which further colonies are 

 seen. The deposit on potato is similar, but soon becomes 

 dirty grey. 



