COMPARATIVE PATHOLOGY. 
353 
mations which are met in other forms of pyrexia. The late re¬ 
searches aiming to discover some kind of parasite, either in the 
exudations, made by Weiss, Zurn, Hallier, Bruylants and Veriest, 
have not yet succeeded in showing the special agent of contagion. 
Dr. Poincare has had the opportunity of examining the lungs 
of eight cows, dead with pleuro-pneumonia, six of which were in 
a barn at some distance from the city, and two in one of the 
suburbs of the same place, and in all cases he observed the 
following phenomena : In the meshes of the substances filling the 
bronchial cavities were found detritus, coming evidently from ex¬ 
ternal sources, particles of straw, hay, starch granules, etc., indi¬ 
cating a state of nervous depression which had prevented the 
action of the reflex expulsive force. With these vegetable re¬ 
mains, he had also found threads of a cryptogamic production 
living, and manifesting its vitality after the death of the animal. 
After a variable length of time, the myceliums of these para¬ 
sites, twisting the meshes of the pulmonary structure, increase 
rapidly in an aqueous fluid, such as sugar water, as the penicellium 
do. They are flattened, ramified, and present some small 
vacuums here and there. The dimensions varied from 0 mm , 0084 
to 0 mm , 0035. 
The objections of the owners of animals have prevented Dr. 
P. from trying the experimental development of the disease by 
exclusive inoculation of this cryptogam ; and thus he is unable to 
affirm that it is the first cause of pleuro-pneumonia. Experiments 
ought to be tried.— Revue cT Hygiene. 
ETIOLOGY AND PATHOGENY OF THE VARIOLA OF THE PIGEON, 
AND DEVELOPMENT OF THE INFECTIOUS MICROBS IN THE 
LYMPH. 
By Dr. Jolyet. 
Dr. Jolyet has found in the blood of pigeons, examined with 
the microscope, when they have been affected with variola, a large 
number of living microbs. The alteration is found in all affected 
birds, whether the disease developes itself apparently spontane¬ 
ously, or is the result of inoculation. The first and second day 
after the inoculation, the blood, under the microscope presents 
