A NEW PASTEURELLOSE. 
331 
the animals have resisted longer ; they represent then the 
transition between the simple atelectasia of the beginning and 
the suppurative lesion of lung disease. 
Articular lesions, when they exist, are very interesting; all 
the periarticular tissues are infiltrated with yellowish and some¬ 
what gelatinous serosity ; the synovial serous membrane is cov¬ 
ered with very rich vascular arborisations, which seem to ex¬ 
tend on the borders of the cartilages of the articular surfaces ; 
the culs-de-sac of the synovials are distended by a great quan¬ 
tity of thick and limpid synovia, strongly yellow or reddish in 
color, and in which more or less dense and abundant clots of 
fibrinous exudates are floating. When the lesion is older, in¬ 
stead of synovia there are thick, dense, and firm fibrinous exu¬ 
dates, which fill the culs-de-sac of the serous membrane and are 
infiltrated between the articular surfaces. In these cases the 
lesion resembles exactly those of the peripneumonic arthritis of 
suckling calves. 
III .—The bacteriological study of the first cases that I ob¬ 
served had given me little encouraging results. Direct exam¬ 
ination had shown nothing positive nor characteristic. All the 
cultures, liquid or solid, had given only abundance of very 
variable microbes, whether they were done with blood from the 
heart, an umbilical clot, the pulp of the liver, spleen or kid¬ 
neys or of the lymphatic glands ; the microbian collection of 
white scour appeared as very rich, too much so, indeed, to draw 
a useful indication. It is then that besides the coli bacillus, 
I found para-coli, para-typhic, white and aureus staphylococcus, 
streptococcus, streptotheric, and fluorescent bacillus and a 
pneumo bacillus, liquifying gelatine, very near relation to 
that of Arloing. Among all those suspects, which was the 
guilty one ? The inoculation of any of those that I had suc¬ 
ceeded in isolating remains without results. 
I was somewhat discouraged with the negative results of 
those researches, when Mr. Steel brought me the femoro-tibio- 
patellar joint of a calf killed the day before, on account of a 
slow form of white scour. 
