200 



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 



NeecUe-tiack * 



- Needle-track 



Fig. 76.— Thrust-Cux-turf. ix G-elaiike 

 OF Staphylococcu-s cereus flavus. 



Fig, 77.— Thrust-Cultuhe in Gelatikk 

 uF Streptococcus pyogenes. 



streak, in the neighbourhood of which further colonies are 

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

 dirty grey. 



