558 BACTERIOLOGY. 
cedema may become so intense that gangrene results; 
such cases usually prove fatal. 
The bacilli are found on microscopical examination 
of the fluid from the pustule shortly after infection; 
later the typical anthrax bacilli are often replaced by 
involution forms. In this case resort may be had to 
cultures, animal inoculation, or examination of sections 
of the extirpated tumor. The bacilli are not present 
in the blood until just before death. Along with the 
anthrax bacilli pus cocci are often found in the pustule 
penetrating into the dead tissue. 
Internal anthraz is much less common in man; it 
does, however, occur now and then. There are two 
forms of this: the intestinal form, or mycosis intesti- 
nalis, and the pulmonic form, or wool-sorter’s disease. 
Intestinal anthrax is caused by infection through the 
stomach and intestines, and results probably from the 
eating of raw flesh or unboiled milk of diseased animals. 
That the eating of flesh from infected animals is com- 
paratively harmless is shown by Gerlier, who states that 
of 400 persons who were known to have eaten such 
meat not one was affected with anthrax. On the other 
hand, an epidemic of anthrax was produced among wild 
animals, according to Jansen, by feeding them on in- 
fected horse flesh. It is evident, therefore, that there 
is a possibility of infection being caused in this way. 
The recorded cases of intestinal anthrax in man have 
occurred in persons who were in the habit of handling 
hides, hair, etc., which were contaminated with spores; 
in those who were conducting laboratory experiments, 
and rarely it has been produced by the ingestion of food, 
such as raw ham and milk. The symptoms produced 
in this disease are those of intense poisoning—chill, fol- 
