174 SUPPURATION. 



FIG. 73. 



f -7t 



,' 



. . t.^k * -v 



Smear from pure culture of gonococcus on agar. (Heiman.) 



Plates are made in the usual way, but instead of agar or 

 gelatin, a mixture consisting of equal parts of liquid human 







Gonococcus in pus-cells. X 1100. (Park.) 



blood-serum and 2 per cent, peptone-agar is used. Within 

 twenty-four hours a few very small dry colonies are seen on 



