DISEASES OF THE HEART IN DOMESTIC ANIMALS. 
453 
which contains but very little fibrous material and always indicates 
a great diminution of vital power. If sanies has once set in, 
resorption is impossible. The change goes through the whole 
effused mass, and all formations with which they come in contact 
are affected by it. 
VII. — Tuberculous Exudation. 
Tuberculous exudation occurs only then in pericardium, when 
the existing effusions become more fully developed, and tubercles 
are already present in the lungs and other organs, and the organ¬ 
ism is predisposed to the development of tubercles in such a de¬ 
gree that everything turns toward tuberculous metamorphose. 
The result has been exhaustively described in another place. Just 
so much need be mentioned here, that where a tuberculous meta¬ 
morphose took place, other exudations united with the tubercu¬ 
lous also occur. 
VIII. — Cancerous Exudation. 
This is also a change of the plastic albuminous exudations into 
cancerous cells in the pericardium, which appear in the form of 
a medullary tumor, in the shape of small knots upon the outer 
and inner surface of the pericardium. The cancerous mass itself 
and the existing serum are generally colored by a secondary 
hemorrhagic effusion. 
IX. —Dropsy of the Pericardium. 
Dropsy of the pericardium is the accumulation of serous fluid 
without intermixed fibrine. This can take place in consequence 
of pericarditis, also without previous inflammation. A light yel¬ 
low, yellowish-green, transparent, perfectly clear serum is found 
in various qualities. Sometimes it is also thin liquid, of a dirty 
brown or brownish-red color, often having a disagreeable odor. 
The muscular substance of the heart is at the same time tender, 
pale, easily torn kind discolored. Dropsy of the pericardium 
occurs mostly in attendance with general dropsy. 
X. —Hemorrhage in the Pericardium 
Occurs in consequence of rupture of the vessels, generally after 
traumatic influences. However, spontaneous hemorrhage can 
also take place if very important disturbances in the circulation, 
