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D. E. SALMON. 
in acute rouget there is ordinarily no changes in the caecum ; in 
the colon the changes are not as constant as in the small intes¬ 
tine ; and then he quotes Klein’s description of the ulcers ob¬ 
served in England. In the chronic form of rouget Cornevin 
makes no mention of these ulcers, although in this form of hog 
cholera they are almost invariably the most prominent lesion. 
We consider this to be a radical and essential difference between 
the two diseases, and we have failed to find any explanation of it 
which would justify us in considering rouget and hog cholera 
as identical diseases. The pneumo-enteritis of England, which 
has been so well described by Klein, is much more closely allied 
to our hog cholera and may be identified with it, but it certainly 
is very different from rouget. 
7th. These diseases caused by different microbes. —The mi¬ 
crobe of rouget is now very well known and has been thoroughly 
studied. It is peculiar in its appearance, in its manner of growth, 
and in the way in which it affects animals. It is a fine bacillus, 
resembling the bacillus of the septicaemia of mice; it multiplies 
in the blood and in the various organs of the body, and is very 
easily detected when examinations are properly made. We have 
this microbe in cultivation in our laboratory, obtained from the 
Pasteur vaccine; have made inoculation experiments with it and 
demonstrated its presence in the inoculated animals. We have 
in this way confirmed the work of the European investigators, 
and have satisfied ourselves that the disease which it produces is 
very different from that produced by hog cholera virus. This 
germ we have never found in any case of hog cholera. 
The microbe of those cases of hog cholera which we have 
studied—and they are now numbered by hundreds—is an entirely 
different organism ; it differs radically in shape, method of growth 
in various substances and in all its characters, from the bacillus 
of rouget. After learning its peculiarities by long study we find 
it an easy matter to detect it in the organs of diseased swine; it 
is easily cultivated in the laboratory, and produces very marked 
and uniform effects when fed or inoculated. 
