266 IMPORTANT VARIETIES OF FISSION-FUNGI. 



Cause of the aspiration pneumonia following division of the vagus. 

 Fliigge: Mikro-organismen, in. Aufl., page 287, and G. Neumann 

 (C. B. II, 755). 



Bacterium pseudomelanosis. P. Ernst (V. A., Bd. 152, 



p. 418). 



In this relationship belongs the interesting organism 

 which Ernst isolated from a case of pseudomelanosis, and 

 recognized as the cause of the same. About the bunches 

 of bacteria there lay in the tissue dark green deposits of 

 sulphid of iron. The organism produces H 2 S very actively, 

 forms gas from sugar, liquefies gelatin, has many flagella 

 and no spores, and is not stained by Gram's method. 



Bacterium salmonicida. (Emmerich and Weibel.) 

 Lehm. and Neum. 



Bacillus of a trout epidemic of Emmerich and Weibel (A. H. xxi). 



Non-motile, short rods, more rarely longer rods and threads, not 

 stained by Gram's method. Facultative anaerobe. Plate cultures in 

 gelatin : Very young cultures resemble those of the streptococcus; then 

 they sink deep into the gelatin, without real liquefaction, the border 

 of the colony becoming irregular and notched. Gelatin stab cultures at 

 first also resemble those of the Streptococcus pyogenes ; later (after 

 five to seven days) there occurs a funnel-shaped, steep-walled, deep 

 cavity about the inoculation line, on the sides and at the bottom of 

 which are delicate, whitish bacterial masses. A gar stab cultures 

 present flat, moistly shining, irregularly outlined growths of a grayish- 

 yellow color, which after many weeks become brown in the center, 

 and simultaneously the upper part of the agar is discolored brown. 

 Bouillon remains clear, only near the top a delicate cloud is formed 

 upon the glass wall, which, upon gentle shaking, sinks very slowly to 

 the bottom as cloudy flakes. A plentiful, whitish sediment gradually 

 collects at the bottom. No growth upon potato. No growth at 37 ; 

 optimum 10-15. We are not acquainted with it. 



The organism was cultivated by its discoverers from trout which died 

 in an epidemic in upper Bavaria. Healthy trout were killed by inocu- 

 lation as well as by adding the organism to water. The principal 

 symptoms of the disease were: at places, where at first there are lentil- 

 sized defects in the scales, furuncle-like swellings gradually develop; 

 then, secondarily, hemorrhagic, suppurating areas form. The organism 

 was abundant in the dead fish, especially in the blood of the heart. 

 The following organism is very similar: 



