ETIOLOGICAL MOMENT OF AMERICAN SWINE PLAGUE. 259 
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color, becoming’ paler towards the peripheries; their surface is 
marked by clefts and irregularities. Their thickness diminishes 
from the center towards their peripheries. The superficial tissues 
are very dry and firable in the middle of these objects, but become 
more moist and more consistent on their outer confines. Smaller 
and less prominent productions may be seen in the vicinity of 
these larger ones. These pathological productions frequently coal¬ 
esce and form large pockets, or come in close proximity to one 
another. Their locaition upon and in the mucosa corresponds to 
the sclerotic, injected, and circumscribed parts of the serosa pre¬ 
viously described.” 
That the above description exactly corresponds to patholog¬ 
ical phenomena found in the large intestine in American swine 
plague is beyond all question. 
There is no question that Roloff was probably more intimate¬ 
ly acquainted with the lesions found in different porcine diseases 
in Germany than any other man that has ever written upon them. 
Detmers wrote to him with reference to the above lesions in 
German and American swine plague and received the following 
answer: 
“ The ulcerous tumors in the ccecum and colon are not found 
in German swine at post-mortem examinations of hogs that have 
been affected with swine plague.”—p. 157, Report 1880. 
The question is, was Roloff right, or do they really occur in 
two essentially different diseases ? 
In a series of articles in the Berliner Klinische Wochen- 
schrift , 1886, No. 44, 45,46 and 47, Hueppe (one of the most 
noted authors on pathogenetic micro-organism in Germany) has 
taken the etiology of the German swine plague into consideration 
and promulgated views of generalization which I can scarcely 
think warranted by existing facts. 
The articles in question are upon the “ wildseuche,” a peculiar 
infectious disease that attacks the deer tribe and cattle and swine, 
under natural conditions, but not sheep, and which has been 
transmitted to horses and the smaller animals generally used in 
experimentation. 
The Germans speak of the deer as “ wild,” and, having no 
