526 BACILLI WHICH PRODUCE SEPTIC4MIA 
a figure 8, and are only stained at the point of contact of the two segments. 
In potato cultures they are sometimes elongated and swollen at one ex- 
tremity. 
Stains with the usual aniline colors and by Gram’s method. | ; 
Biological Characters.—An aérobic and facultative anaérobic, non-lique- 
fying, actively motile bacillus. Spore formation not observed. Grows in the 
usual culture media at the room temperature—more rapidly at 37° C. In 
gelatin stab cultures yellowish-white colonies are developed along the line 
of puncture; at the bottom these may have a diameter of one to two millime- 
tres, and they havea brown color. Upon the surface an irregular, lobulated, 
whitish, translucent, paraffin like layer is developed. At the end of eight 
days the surface growth consists of large, confluent, transparent plaques, 
with irregular outlines and crenated, elevated margins ; along the line of 
puncture large, separate, lenticular or spherical cvlonies are seen ; these 
have a brownish-white color. At the end of two months the surface growth 
is concentric and still more transparent, while the colonies near the surface 
have become almost brown. Upon the surface of agar, at 87° C., a narrow 
band is developed along the line of inoculation; above, this is composed of 
transparent, shining, flat, round colonies having a diameter of one milli- 
metre or more; below, the colonies are confluent and form a transparent, 
whitish layer. In glycerin-agar development is still more abundant, and 
may already be perceived at the end of twelve hours. Crystals are seen 
below the surface in agar cultures and about the superficial colonies in gela- 
tin. Upon potato a uniform, thin, grayish, very transparent layer is de- 
veloped, which sometimes has a brownish-gray tint. At the end of a few 
days the potato acquires a brownish color, In bouillon cloudiness of the 
medium is apparent at the end of ten hours ; twenty-four hours later a 
whitish precipitate is seen at the bottom of the tube, which is more abun- 
dant when the culture medium contains glucose; later a thin pellicle is 
seen upon the surface and the bouillon acquires a yellowish color. 
Pathogenesis.—Recent cultures are pathogenic for rabbits, guinea-pigs, 
pigeons, and mice, which die from general infection in from two to four 
days. Old cultures are less virulent. 
BACILLUS OF LUCET. 
Obtained by Lucet (1891) from chickens and turkeys suffering from an 
infectious form of septiczemia characterized by dysenteric discharges—'‘‘ Dy- 
senterie epizootique des poules et des dindes.” 
Resembles Bacillus gallinarum of Klein, and is perhaps identical with 
this microdrganism. ; 
Morphology.—Short bacilli, from 1.2 to 1.8 # long, usually in pairs. 
Stains with the usual aniline colors, but not by Gram’s method. 
Biological Characters.—An aérobic and facultative anaérobic, non-lique- 
fying, non-motile bacillus. Spore formation not observed. Grows slowly in 
the usual culture media at the room temperature—more rapidly at 37° C. 
In gelatin plates small, shining, moist, white, circular colonies are devel- 
oped, which look like little drops of wax; later these increase in size, and 
especially in thickness, forming hemispherical masses. In gelatin stab cul- 
tures grayish, punctiform colonies are developed along the line of puncture, 
and upon the surface a circular, prominent, whitish plaque. Streak cultures 
upon the surface of gelatin are in the form of a dirty-white or grayish-white, 
moist streak, with regular margins, limited to the line of inoculation, but 
increasing in thickness until it breaks loose and slips down the oblique sur- 
face of the culture medium. _ The deposit which collects in this way acquires, 
as it becomes old, in the deepest portion a reddish color. Upon agar it forms 
a thick, yellowish-white, mucus-like layer with straight or slightly dentate 
margins. In bouillon it produces a decided clouding of the liquid, and an 
abundant grayish, pulverulent sediment accumulates at the bottom of the 
tube; the bouillon after a time becomes transparent above this sediment and 
