AN OUTBREAK OF RABBIT SEPTICAEMIA. 
291 
cases in which the rhinitis was marked. The nasal discharge 
was usually observed for from several days to a few weeks 
without any noticeable effect upon the general health of the 
animal. For a day or two before death the rabbits ate spar¬ 
ingly and sat in a somewhat crouched position. 
Pathology .—The rabbits were not emaciated, excepting a 
few old females that were nursing young. The most char¬ 
acteristic lesion was an inflammation of the pleura or perito¬ 
neum with the effusion of a small quantity of serum and the 
migration of round cells. The pleura was most often affected. 
Usually the pleural cavity contained a large quantity of cellu¬ 
lar substance. The parietal pleura was covered with an exu¬ 
date composed of fibrin cells and bacteria. In rabbit No. 
6 the lungs were covered with a thin, grayish, membranous 
exudate, which was removed with difficulty. In ten cases the 
lungs were more or less hepatized. The others were hyper- 
asmic with areas of collapse, excepting in No. 20, where they 
were normal, and Nos. 489 and 482, where there was marked 
emphysema. In all cases of hepatization the dependent por¬ 
tion of the cephalic lobes were affected, and in most instances 
the dorsal portion of the principal lobes. Upon section the 
hepatized tissue presented a grayish (necrotic) appearance. 
The bronchioles were filled with a thick muco-purulent sub¬ 
stance. The microscopical examination of sections of the 
lung tissue that were hardened in alcohol showed the alveoli 
to be filled with round cells and the capillaries distended with 
blood. In the areas where the disease was more advanced 
the cells were breaking down. The changes in the dependent 
portion of the cephalic lobes were invariably more advanced 
than the hepatization elsewhere, excepting where the entire 
lung was necrotic. 
The trachea contained more or less purulent substance, 
and the mucosa was deeply reddened. The larynx was usually 
nearlly filled with muco-pus. The mucosa of the nares was 
thickened and opaque. In nearly every case the nasal cavi¬ 
ties contained considerable muco-purulent substance. In 
Nos. 15, 20 and 26 there was exudative peritonitis with pleu¬ 
risy, and in Nos. 7 and 19 peritonitis only. The livers were 
