. A text-book of bacteriology. Bacteriology. 523 BACILLI WHICH PRODUCE SEPTICEMIA. tion the capsule is so deeply stained that the bacillus is hidden; by careful treatment with a weak solution of acetic acid the capsule may be differen- tiated as a pale-red or violet envelope surrounding the deeply stained bacilli. Biologtcai Characters.—An aer- obic and j^acultative anaerobic, non-liquefying, non-motile bacillus. Spore formation not observed. Grows in the usual culture media at the room temperature. The cul- tures in agar or upon potato are very viscid and draw out into long threads when touch
. A text-book of bacteriology. Bacteriology. 523 BACILLI WHICH PRODUCE SEPTICEMIA. tion the capsule is so deeply stained that the bacillus is hidden; by careful treatment with a weak solution of acetic acid the capsule may be differen- tiated as a pale-red or violet envelope surrounding the deeply stained bacilli. Biologtcai Characters.—An aer- obic and j^acultative anaerobic, non-liquefying, non-motile bacillus. Spore formation not observed. Grows in the usual culture media at the room temperature. The cul- tures in agar or upon potato are very viscid and draw out into long threads when touched with the pla- tinum needle; the blood of an ani- mal killed by inoculation with this bacillus has the same viscid charac- ter. Upon gelatin plates minute colonies are first visible at the end of twenty-four to thirty-six hours; later the deep colonies are white, oval masses the size of a pin's head; the superficial colonies attain the size of a lentil, and are flattened, hemispherical masses with a porce- lain-white color. In gelatin stab cultures growth occurs to the bot- tom of the line of puncture, and on the surface a shining white, circular, arched mass forms around the point of puncture, resembling the growth of Friedlander's bacillus. Upon the surface of agar, at 37° C , at the end of twenty-four hours a thick, soft layer of a pure white color is formed, which is very viscid and resembles the growth of Micrococcus tetragenus upon the same medium. Upon potato an abundant and viscid, shining, yellowish- white layer is quickly developed. Pathogenesis.—Pathogenic for white mice and for house mice, which die at the end of two or three days after being inoculated at the root of the tail with a small quantity of a pure culture. Inoculation from mouse to mouse increases the virulence of the cultures. At the autopsy the superficial veins are distended with blood, the inguinal glands enlarged, the spleen consid- erably enlarged, the liver and kidneys hypersemie, the intest
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