112 BACTERIOLOGY 



Gelatin colonies. In 36-48 hours, minute yellowish dots, becoming yellowish 

 granular entire disks, becoming in 4 days I mm., pale yellow and slightly 

 sunken ; liquefaction slow. Microscopically, pale yellow, entire, homo- 

 geneous ; later with irregular margins and slightly granular. 



Agar slant. A yellowish band, 3 mm. wide, smooth, pale yellow, with irregular 

 margins. 



Gelatin stab. On the surface a white irregular button, and a slow crateriform 

 liquefaction; in 10 days a stratiform liquefaction to a depth of 10 mm. 

 Liquefied gelatin cloudy. 



Potato. No growth. 



Bouillon. Clear, with white flocculi at the bottom, and a pellicle on the surface. 



Pepton-rosolic acid. Unchanged. 



Litmus milk. Unchanged. 



Glucose gelatin stab. A good growth in depth ; no gas. Indol negative : 

 Growth at 36 C. 



Habitat. Soil. 



7. Sarc. lutescens Stubenrath 



Sarc. livido-lutescens Stubenrath : Lehmann-Neumann, Bak. Diag., 1896. 

 Imperfectly described. From stools in a case of enteritis. 



8. Sarc. equi Stubenrath 



Like Sarc. lutea, except as specified in the synopsis. 

 Habitat. Isolated from the urine of horses. 



9. Sarc. lutea Flugge, 



Die Mikroorganismen, 1896, 182. 



Morphology. On all media typical packets. 



Gelatin colonies. Deep : round, dark yellow, entire, granular. Surface : round 

 punctiform, sulphur-yellow; after 10-12 days, sunken. Microscopically^ 

 round, entire, yellowish, granular, becoming irregularly bordered. 



Gelatin, stab. In depth, growth filiform slightly beaded; on the surface, 

 growth round-irregular, moist, glistening, raised, citron-yellow, becoming 

 in 10-12 days a liquefied funnel ; in other cases no liquefaction. 



Agar colonies. Deep : like gelatin colonies, but more coarsely granular. 

 Surface : round, entire, raised, moist, glistening, sulphur-yellow. Micro- 

 scopically, round, entire, granular ; border more transparent. 



Agar slant. A sulphur chrome yellow layer of a buttery consistency. 



Bouillon. Clear, with much sediment. 



Milk. Coagulated. 



