

BACTERIUM FULVUM. 271 



In the gelatin stab there is no striking growth. The sur- 

 face growth is leather-brown to orange and reddish-orange. 

 When liquefaction occurs, there is formed a funnel, filled 

 with turbid fluid ; later the liquefaction became cylindric 

 and sometimes there is a pellicle. 



Agar stab : Succulent orange-yellow to yellowish brown- 

 ish-red. (Compare, for example, 5, v. ) Potato growth is 

 the same. 



Milk : It is not coagulated, but both of our liquefying 

 forms changed it into a yellowish turbid fluid, with an 

 orange sediment, upon which the yellowish cream floated. 

 A non-liquefying form coagulated milk (original culture 

 of Bact. tremelloides Schottelius). No gas is formed from 

 sugar. Little indol and no H 2 S are produced. Found by 

 us in water and milk. 



We consider that the following varieties, which we have 

 ourselves investigated, belong here : Bacterium bruneum 

 Schroter, which we obtained from A. Fischer ; Bacterium 

 tremelloides Schottelius, obtained from the discoverer 

 himself. The description of Zimmermann's Bacillus 

 fuscus Fliigge corresponds completely. * 



The Bacterium mycoides roseum Scholl appears 

 very closelv related, although deviating somewhat in color 

 (Fort. d. Med., vn, 46). 



What we obtained from Hauser as Bacillus arbores- 

 cens Frankland is also the same, and neither corresponds 

 with Frankland' s original description (Z. H. vi, 379) nor 

 with that of Zimmermann. The deviation from Frank- 

 land consists in the loss of liquefaction (absence of bun- 

 dles); in Zimmermann's description it is said not to stain 

 by Gram's method. We have never been certainly con- 

 vinced regarding motility, and so far have been unable to 

 stain flagella. 



1 The description given by Schroter himself of his Bact. bruneum 

 corresponds very poorly, as does the description of Fliigge of his Bacil- 

 lus fuscus. Therefore we select the oldest of the newer names, which 

 is characteristic, and the description of which corresponds well with 

 our cultures. 



