258 MANUAL OF BACTERIOLOGY. 



gonorrheal conjunctivitis. It has been found to be the cause 

 of many cases of pyosalpinx, as well as of gonorrheal proc- 

 titis, arthritis, myocarditis and endocarditis; these conditions 

 compKcating gonorrhea may also be secondary or mixed in- 

 fections. 



Bacillus of Soft Chancre (of Ducrey). — A small, oval 

 bacillus, usually occurring in chains. It stains with ordinary 

 aniline dyes, but not by Gram's method. It has been culti- 

 vated on human blood-agar (also rabbit blood-agar; the 

 medium deteriorates in a few weeks- — Davis). It is cultivated 

 with difficulty. It is found in the pus of soft chancre or chan- 

 croid, usually mixed with other organisms. It has been dem- 

 onstrated in sections of the ulcers. There seems to be un- 

 certainty with respect to its occurrence in ' buboes. Ducrey 

 was able to secure it in pure culture by successive inoculations 

 on the human skin. Although this bacillus has not yet been 

 sufficiently studied, there seems httle doubt that it is the cause of 

 soft chancre.* 



Bacillus pneumoniae (of Friedlander), or Bacillus mucosus 

 capsulatus.'\ — ^A short bacillus with rounded ends, sometimes 

 growing out to a greater length; sometimes occurring in pairs; 

 surrounded by a capsule which is seen only in preparations 

 made from the tissues of infected animals, and is not seen in 

 cultures. This bacillus is not motile. It does not form spores. 

 It stains with the ordinary anihne dyes, but does not stain by 

 Gram's method. It is aerobic and facultatively anaerobic. 

 It may be cultivated at ordinary temperatures, but grows better 

 in the incubator. It does not liquefy gelatin. Stick-cultures 

 in gelatin develop a round, flat knob at the point where the 

 puncture enters the surface of the gelatin, making what is called 

 a "nail-shaped" growth; the growth in gelatin is white; in old 



* Davis. Journal Medical Research. Vol. IX. 1903. 

 t Howard. Philadelphia Medical Journal. Febraary ig, 1898. Curry, 

 Howard, Perkins. Journal Experimental Medicine. Vols. IV. and V. 



