CONTRIBUTIONS TO COMPARATIVE PATHOLOGY. 619 
large ossification, of the size of an egg, and further down (about 
the tenth vertebra) there was another ossification, of about two 
inches in length, but not so thick as the first-mentioned. The 
lobe of the lung under the first ossification was indented 
exactly to fit it, and the lungs appeared indented in different 
parts. The other lung was but little congested. 
CONTRIBUTIONS TO COMPARATIVE PATHOLOGY. 
No. XVI. 
By Mr. Youatt. 
ANEURISM OF THE POSTERIOR AORTA BREAKING WITHIN 
THE PERICARDJUM ENLARGED MESENTERIC GLAND- 
TUMOURS IN THE STOMACH. YOUNG TIGER. 
1836, July 1 hth . — I yesterday fancied that there was some 
swelling on the forehead, occupying nearly the full extent of the 
frontal and parietal bones. It is more evident now. On coax- 
ing the animal to the bars, I was enabled to examine it ; and I 
found a very considerable effusion, beneath the skin of the fore- 
head, projecting in the centre, and almost ready to burst. I 
watched for an opportunity, and plunged my lancet into it. At 
least three ounces of bloody purulent matter escaped. Was this 
the consequence of some violent blow in his gambols — he gives 
himself many an one — or does it indicate a scrofulous habit, a 
disposition to the formation of such abscesses ? I hope the 
former. Nothing more can be done at present. 
17th . — The tumour was disposed to fill again yesterday, but 
to-day it has considerably subsided, and nothing more appears 
necessary to be done. 
1 8th . — The tumour has gone quite down, and the animal is as 
well and playful as ever. 
31s£. — There is a little tumour beginning to appear in the 
space between the branches of the lower jaw. It is visible 
enough if the eye, and when by chance the finger can be placed 
on it, it fs" perfectly hard. I am afraid, coupling this with the 
abscess in the forehead a little while ago, that there are indica- 
tions of a scrofulous taint, as in the lioness that last died. We 
will anxiously watch a little, and, if necessary, attack the disease 
in good earnest. 
