RECORD OF PROCEEDINGS 
363 
recognize the theory of spontaneity. In England, some so-called 
spontaneous cases were always found to be spurious, and could 
be traced to contagion. 
Mr. Degive objected to the remarks of Mr. Tisserand in relation 
to the nature and symptoms of the disease. He admitted the spon¬ 
taneity, not as a spontaneous genesis , but as resulting from the 
transformation of certain germs as the exclusive cause of the 
propagation of the disease. 
Mr. Tisserand proposed the following resolution in place of 
that submitted by the reporter : 
( a ) Differential Diagnosis. —“ In the anatomical point of view, 
one must consider as acute contagious pleuro-pneumonia, all 
lobular alterations of the lung, accompanied by a very evident 
and semi-transparent thickening of the interstitial cellular tissue, 
and of the corresponding pulmonary pleura. 
“ In chronic cases, the pathognomonic lesion is always found 
at one of several points of the lung, more or less near to purulent 
centres. 
“ The introduction of a new animal into a barn during the 
month, or even the year, preceding the appearance of the disease, 
renders the diagnosis much more certain. 
“ 2d.—Considered from the physiological point of view, in 
the living animal, epizootic pleuro-pneumonia, as soon as it 
becomes apparent, is specially characterized by contagiousness, 
and the following symptoms, existing together or independently 
of others: 
“ Painful, moist and rather weak cough; sensibility of the 
chest on percussion of the thorax; respiration hesitating and 
interrupted. 
“ 3d.—The report is unchanged. 
“ 4th.—The fact of the presence of one case of pleuro¬ 
pneumonia, apparently spontaneous, does not disprove the 
existence of contagious disease. 
(b) Prophylaxy. 
1st.—“ The chances of immunity against pleuro-pneumonia 
can be increased by the aid of good hygienic conditions.” 
In view of the proposition of Mr. Berdez, Messrs. Wehenkel 
i 
