( 523 ) 
Urobacillus freudenreichii Miqver, 
Urobacillus freudenreich is a little moving bar, 5—6 u in length, 
1 u broad; on a firm medium it grows into long threads. 
Elliptic glittering endospores are formed, which can stand a heat 
of 94° for two hours. 
Neutral gelatine is slowly melted by the irregularly formed colo- 
nies, whilst- gelatine to which ureum has been added, is not melted 
and the colonies on it assume the characteristic globular form. 
2°/, ureum in bouillon are decomposed within 4 days at 30°—35°. 
MrqurL isolated this species out of air, riverwater, soil and from the 
excrements of ruminants. 
Urobacillus maddoxti Miqver. 
A little moving bar, 3—6 « long, 1 u broad, forming oval endo- 
spores, which are able to bear a heat of 94° for two hours. 
On neutral meat-gelatine it does often not develop, on ammoniacal 
gelatine the growth is rather good. 
Within 3 days 2°’, ureum in bouillon is split. 
The bacterium has been isolated from sewage and river-water. 
Urobacillus duclauxii Mrquer. 
Like the two preceding species moving; length 2—10 4, breadth 
0,6—0,8 u. 
The bacterium forms small elliptic endospores which are able to 
bear a heat of 95° for 2 hours. 
In a neutral medium no growth arises, on ammoniacal meat- 
gelatine or on meat-gelatine provided with ureum there arise very 
small hardly observable colonies which are surrounded by crystals. 
The gelatine does not melt, but it becomes like viscous after 
40 —50 days. 
2°/, ureum in bouillon are decomposed within 24 hours. 
Urobacillus jakschit. 
Urobacillus jakschti is a small quickly moving bar in a culture- 
medium that is not too alkaline; if some percents of the ureum in 
it have been split, the motion stops. 
Length of the bacterium 5—7 u; breadth 1—1.5 u. Spores are 
not formed. 
