DISEASES OF THE HoG. 171 
toms of its full development. That the rheumatic 
differs essentially from ordinary inflammation is 
shown chiefly by its shifting character, its disposi- 
tion to alternate with mere irritation or functional 
disorder, and the almost entire absence of any 
tendency to suppuration, even in the most violent 
cases.” 
Causes: It is impossible to say what causes 
rheumatism in the pig, as it is found under all con- 
ditions, when the pigs are well kept and when they 
are not. Cold seems to be an exciting cause of 
acute rheumatism, moisture increases its effect, 
thus it is often found in pigs which have to sleep 
in wet, cold beds, but in the majority of cases some- 
thing morethan cold and moisture is needed. Sub- 
acuté rheumatism is the form usually found in the 
pig, although I have seen a few cases of acute rheu- 
matism. : 
Symptoms: There is lameness of one or more 
legs which is more or less noticeable according to 
the severity of the case. The joints often swell at 
the fetlock. If the:swelling is inflammatory there 
will be decided fever and thus constitute acute 
rheumatism, causing a rise in temperature, a full, 
fast pulse, loss of appetite, and an indication that 
the animal is suffering, pain. I have seen some 
cases of this kind where if the pig was made to 
move it would squeal with pain. From the effects 
of the inflammation there may be an increased se- ' 
cretion of the synovial fluid and fluctuation may 
be noticed in the joints. In some cases the carti- ~ 
lage and tissue of the joints become enlarged and 
