280 IMPORTANT VARIETIES OF FISSION-FUNGI. 



which belongs here, and which sometimes was motile and 

 sometimes not (C. B. L. iv, 902). 



Bacterium indigonaceum. (Claessen, Schneider.) 

 L. and N. 



Obtained from Krai, from Prague. Rods, 1.6-3/x long, 

 0.8-0.9/x thick, somewhat thicker than violaceum, some- 

 times curved. Upon the gelatin plate, which is not lique- 

 fied, there appear, macroseopicalty, small, blue, drop-like 

 growths. When slightly magnified, they are sharply 

 rounded, yellowish disks, slightly granular and later 

 becoming indigo-blue from the center outward. Upon the 

 agar plate they are similar. The surface growth in the 

 gelatin stab is sky-blue, moist, sometimes also remaining 

 white. The growth upon potato is deep indigo-blue, 

 somewhat granular ; later it presents a coppery -red, 

 metallic luster, very similar to solid indigo. It renders 

 bouillon cloudy and forms a pellicle upon it. Milk is not 

 coagulated, but is colored bluish-green. The bacterium is 

 not motile. We have not examined it for flagella. Re- 

 garding the pigment, see page 67. 



The original description of Claessen (C. B. vn, 13) and 

 the description of Voges of the Bacillus indigoferus, 

 which was obtained from tap- water in Kiel, differ only in 

 the statement that the latter organism is actively motile, 

 and that this depends upon a polar flagellum. We ex- 

 amined a culture from Krai and verified all the statements 

 of Voges, so that here also are two varieties which differ 

 only as regards flagella, and which really belong together. 



Bacterium caeruleum. Voges. (L. and N.) 



Literature. — Voges (C. B. XIV, 301). Our description is from a 

 culture from Krai. 



Microscopically, longer and shorter motile bacilli, resem- 

 bling the Bact. coli. Do not stain by Gram's method. 



They grow well also anaerobically. 



Gelatin stab : surface growth thin, with a dull luster ; 

 deep blue, slowly becoming depressed. Stab, thread-like, 

 with little nodules. The surface growth in agar has a 



