46 CLINICAL BACTERIOLOGY 



Bacillus Friedlander. 



Biological Characters. — 1. On gelatin plates it grows 

 forming small porcelain-like clusters without liquefaction. 



2. In gelatin (stab culture) at 20° C. a white growth 

 appears along the centre, showing the characteristic nail- 

 head formation. Gas formation on shaking gelatin. 



3. On agar a white layer is formed. 



4. On potato a whitish-yellow layer develops, with gas 

 formation. 



Staining. — Carbol- methylene blue or weak carbol- 

 fuchsin. 



Microscopical Appearances. — Short rods with rounded 

 ends, and surrounded by a distinct capsule under special 

 circumstances of growth. 



This bacillus is aerobic and anaerobic, growing at room or 

 incubator temperature. 



