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 cjdindric 

 and sometimes there is a pellicle. 



Agar stab : Succulent orange-yellowto 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 j^ellowish cream floated. 

 A non-liquefying form coagulated milk (original culture 

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

 sugar. Little indol and no HjS are produced. Pound 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 corresj)onds completely. ^ 



The Bacterium mycoides roseum Scholl appears 

 verv closelv related, although deviating somewhat in color 

 (Fort. d. Med., vii, 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. 



' 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. 



