142 ESSENTIALS OF BACTERIOLOGY. 



Micrococcus Pyogenes Tennis. (Rosenbach.) 



Origin. Found in the pus of large inclosed abscesses. 



Form. Cocci, without any especial arrangement. 



Properties. Not much studied. 



Growth. Cultivated on agar, it forms clear thin colonies; along 

 the needle-track an opaque streak, looking as if varnished over. 



Bacillus Pyocyaneus. (Gessard.) 



Synonyms. Bacterium aeruginosum, bacillus fluorescens. 

 (Schroter.) The bacillus of bluish-green pus. 



Origin. Found in 1882 in the green pus in pyocysemia. 



Form. Small slender rods with rounded ends, easily mistaken 

 for cocci. Often in groups of four and six, without spores. 



Properties. Very motile ; liquefy gelatine rapidly ; a peculiar 

 sweetish odor is produced in the cultures, and a blue pigment. 



FIG. 78. 



w>p* <f ^; - j. 7 > - % , V3 



Se^SftsSsi 



-< 3f&-j-&~i&-*& 

 > / >^ *,a?, $ * 

 -r%$V 



^$vt" 



-v ^ ^ 



*t 



Bacillus pyocyaneus, from an agar-agar culture ; X 1000 (Itzerott and Niemann). 



Growth. Develops readily at ordinary temperature, growing 

 quickly and mostly on the" surface ; it is aerobic. Colonies on gela- 

 tine plate, in two or three days a greenish iridescence appears 

 over the whole plate, the colonies having a funnel-shaped lique- 

 faction, and appearing under low power when still young, as 

 yellowish green, the periphery being granulated. 



Stab Cultures. Mainly in upper strata, the liquefaction funnel- 

 shaped, the growth gradually settling at the bottom, a rich green 



