112 NEW YORK, ZOOLOGICAL SOCIETY: 
One of the most interesting of the rare diseases was a case 
of aneurism of the heart, which occurred in a Newfoundland 
caribou. The case is of such interest that I shall abstract quite 
extensively from the protocol and microscopical examination. 
The animal had been ailing for some time, suffering from 
occasional attacks of diarrhoea and finally dying apparently from 
malnutrition. At the post-mortem the following cardiac condi- 
tion was found: 
“The heart as a whole is large and well formed. The epicar- 
dium shows no areas of thickening or of injection, except over 
the posterior portion of the apex, where a thick fibroid scar ex- 
tends forward to a little beyond the anterior border. The entire 
scar measures 6 cm. vertically, and 4 cm. horizontally. The 
scar involves the left ventricle near its apex chiefly. On incising 
this tissue it is found to contain large blood clefts, many lymph 
spaces, and to be made up mostly of loosely arranged connective 
tissue, the external layers of which are much more compact. 
The average thickness of the scar which extends through the 
entire wall of the ventricle is 5 cm., and it has evidently bulged 
out from the regular contour of the heart to a considerable de- 
gree when under blood pressure. 
“The myocardium, as a whole, is pale and abnormally soft. 
The auricles show general thickening of the endocardium, es- 
pecially of the left auricle, and the mitral valves show a moderate 
degree of relative insufficiency. All the cavities of the heart 
contain a small amount of mixed clot. 
“The arch of the aorta shows a slight degree of atheroma, which 
is not continued into the coronary trunks, the intima of which 
appears normal, though the vessels are of unusually wide calibre. 
The lower one-third of the left coronary artery which should 
supply the area involved by the scar is completely occluded, and 
from this point on is marked as a simple fibrous cord extending 
down, and finally blending with the fibrous wall of the aneurism. 
“The muscle cells in sections remote from the gross lesion 
show a highly granular cytoplasm, and a few contain oil globules, 
some of large size. The fatty degeneration is much more pro- 
nounced in sections taken from near the aneurismal wall. There 
is a marked infiltration with small round cells in the immediate 
neighborhood of the fibroid area, the muscle fibres becoming 
more and more infrequent and more highly degenerated as the 
aneurism is approached, where muscular tissue is completely re- 
placed by adult and embryonic connective tissue, the cells of 
which show a still active state of hyperplasia. The blood-vessels 
