64 
W. ZUILL. 
the animals which recovered had acquired immunity to subse¬ 
quent attacks. 
Experiments as to the preventive power of inoculation were 
also made by the commission, which, although not carried far 
enough to be conclusive, showed the direction in which other ex¬ 
periments should be prosecuted ; and, profiting by their experi¬ 
ence, Dr. Willems, of Hasselt, Belgium, found that in fifty-four 
cases inoculation at the root of the tail with fluid taken from the 
lungs of animals dying of this disease, conferred complete im¬ 
munity in thirty-eight cases, though the operation proved fatal in 
six cases. Similar results were obtained by Dutch and Belgian 
commissions. 
{To be continued.\ 
CONTAGIOUS PLEURO-PNEUMONIA. 
Thesis presented by W. Zitill, D.Y.S., before the University of Pennsylvania, 
Medical Department. 
( Continued from page 13.) 
October 4th.—Wishing to make further investigations of con¬ 
tagious pleuro-pneumonia, I to-day visited West Chester, Ba., for 
that purpose, in the company of Mr. Thomas J. Edge, Secretary 
of the State Board of Agriculture, and Dr. Bridge, the Veterin¬ 
arian of the Board; here we met Dr. Salmon, of Washington, 
and Prof. Huidekoper, of Philadelphia, on errands similar to my 
own. 
The first farm visited by us was owned by Wm. Eaches; here 
three pnimals which had been separated from the rest of the herd 
were found infected with contagious pleuro-pneumonia. These 
animals were slaughtered, and autopsia made. 
Before taking up in detail the symptoms of the individual 
cases, perhaps it would be well to give a general description of 
the most marked and prominent diagonistic symptoms of the 
disease. 
When an animal is first noticed to be unwell, and attention 
called to the fact, the premonitory symptoms, as a rule, have 
passed by, as an examination will show that extensive structural 
