PLATE VIII. 



FIG. i. Sarcina lutea. 



Tube of nutrient agar-agar inoculated from a plate- 

 cultivation. The canary-yellow colour forms a 

 strong contrast to the colour of the growth in the 

 adjacent tube. 



FIG. 2. Streptococcus pyogenes aureus. 



StapJiylococcus pyogenes aurcus. 

 Micrococcus pyogenes aureus. 



Tube inoculated from an abscess in a rabbit. 



FIG. 3. Bacillus pyocyaneus. 



Bacillus fluoresccns. 

 Bacterium aeruginosum. 



Tube inoculated from a colony on a plate-cultivation. 

 The growth formed a whitish, transparent layer 

 composed of slender bacilli. The pigment diffused 

 itself throughout the nutrient jelly. The growth 

 appears green by transmitted light owing to the 

 colour of the medium behind it. The bacillus is 

 now regarded as identical with the bacillus of 

 green -blue pus. 



