48 



THE OBGANISM IS A BACILLUS. 



THE GELATINE IS NOT LIQUEFIED. 



THE OEGANISM IS CHBOMOGENIC. 



THE COLONIES APPEAE WHITE, THE MEDIUM 

 BECOMING COLOUEED. 



Bacillus iris, small, slender, non-motile bacilli, producing a fluor- 

 escent green colour, becoming yellow, and finally dark green. 



Bacillus erjrthrosporus (Eidam), from water and putrefying flesh 

 infusions, small motile baoiUi in short filaments, forming oval 

 spores ; this organism will not grow in the incubating oven ; 

 the medium becomes green by transmitted, yellow by reflected, 

 light. 



Bacillus fluorescens putidus (Fliigge), from water; the gelatine 

 acquires a fluorescent green colour, with an odour of trimethyl- 

 anun. 



Bacillus virescens (Frick), from greeri sputum ; an actively motile 

 bacillus, 1 to 3 /i in length, forming filaments ; a green pigment 

 is formed after several weeks, becoming brown and then dark 

 green and fluorescent. 



Bacillus dentalis viridans (Miller), from carious dentine ; shghtly- 

 curved bacilli with pointed ends ; the gelatine cultures acquire 

 an opalescent green colour. 



Bacillus cyanogenus (Hueppe), bacillus of blue mUk; an actively- 

 motile bacillus, 1 to 4 jn long ; the agar or gelatine acquires a 

 grayish-blue tint; if added to non-sterilized milk a sky-blue 

 colour is produced at ordinary temperatures, not at 37° C. ; no 

 colour is formed on blood serum. 



Bacillus janthinus (Zopf), from sewage ; a slender, motile bacillus, 

 '2 jiin length ; develops rapidly in milk, which acquires a violet 

 colour without coagulation. 



