720 
S. WHITBECK. 
Conclusions .—An aerobic organism causing suppuration, and 
when gaining entrance into the circulation, septicaemia. 
Bacillus Pyocyaneus.— August 12, inoculated gelatin 
from discharge of an open synovial bursa. August 13, a small 
white growth developed at point of inoculation. August 16, 
gelaiin liquefied, and of a greenish color. August 18, inocu¬ 
lated agar-agar. August 20, a small white growth at point 
of inoculation which by the 22d had spread all over the sur¬ 
face of media, and was of a dark white color. August 28, 
agar-agar was of pale green color. August 15, inoculated 
bouillon from gelatin. August 16, bouillon of a dark green 
color. Microscopical examination showed the germ to be a 
bacillas of medium length, scattered through the field without 
any definite arrangement. On the 18th inoculated potato in 
tube. August 19, a white growth at point of inoculation. 
August 21, growth extended over entire surface of potato, 
producing the characteristic green color presented by the 
other media inoculated with this germ. On the 27th inocula¬ 
ted a mouse. August 28, mouse dead, a large abscess having 
developed at seat of inoculation. 
On post-mortem examination the entire viscera presented 
a dark green color. Inoculation on agar-agar from the liver 
and peritoneal cavity produced a growth of bacilli similiar to 
that described above. Two more mice were inoculated, pro¬ 
ducing abscesses at seat of inoculation ; in this connection it 
might be well to say that a large amount of the culture was 
used in first instance and the inoculation made well under the 
skin, while the two latter mice were inoculated externally on 
an abraded surface produced by a small pair of scissors. A 
rat was inoculated September 8th, but without any effect. 
Conclusions .—An aerobic bacillus producing a pigment, 
which Gessard called pyocyanin, that colors the media green. 
Germ of suppuration, and when gaining entrance into the 
circulation in sufficient numbers, causes septicaemia and 
death. 
Pyogenes Fcetidus. September 12, inoculated agar-agar 
from liver of horse that died of septic poisoning. September 13, 
a white growth at point of inoculation. September 14, growth 
