666 BACTERIA OF CADAVERS AND OF PUTREFYING MATERIAL. 
such a mass, or in organic liquids to which the air has free access. 
Among the most common putrefactive bacteria are the Proteus vul- 
garis, Proteus mirabilis, and Proteus Zenkeri of Hauser. Formerly 
the minute motile bacteria found in putrefying animal infusions, etc., 
were commonly spoken of as belonging to the species ‘‘ Bacterium 
termo,” but recent researches show that several different species were 
included under this name by those whose researches were made be- 
fore the introduction of Koch’s method for isolating and differentiat- 
ing microérganisms of this class by the use of solid culture media. 
The different species of Proteus are all facultative anaérobics. They 
are more or less pathogenic, and according to Hauser produce a chem- 
ical poison which, when injected into small animals, causes death with 
all of the symptoms of putrid intoxication. The bacillus of mouse 
septicemia, which was first obtained by Koch from a putrefying meat 
infusion, is also pathogenic, as are the writer’s Bacillus cadaveris 
and various other anaérobic bacteria found in putrefying material. 
Some account of the various products of putrefaction and the 
microérganisms concerned in their production will be found in Sec- 
tion IV., Part Second, of the present volume. 
