ase 1.--This cow had been sick for nineteen days; was feeble, without
much appetite, with diarrhoea, cough, shortness of breathing, hair
staring, etc. Percussion dull over the whole of the left side of the
chest; respiration weak. Killed by authority. Several gallons of serum
were found in the left side of the chest; a thick, furzy deposit of
lymph over all the _pleura-costalis_. This lymph was an inch in
thickness, resembling the velvety part of tripe, and quite firm. There
was a firm deposit of lymph in the whole left lung, but more especially
at its base, with strong adhesions to the diaphragm and
_pleura-costalis_ near the spine. The lung was hard and brittle, like
liver, near its base. No pus. Right lung and right side of chest
healthy.

Case 2.--This cow was taken very sick, January 30th. In fourteen days,
she began to get better. April 12th, she is gaining flesh, breathes
well, hair healthy, gives ten quarts of milk a day, and in all other
respects bids fair for a healthy animal hereafter, except a slight
cough. Percussion dull over base of the left lung, near the spine, and
respiration feeble in the same regions.

Autopsy.--Left lung strongly adherent to diaphragm and costal pleura;
the long adhesions well smoothed off; _pleura-costalis_ shining and
healthy. Also, the surface of the lung, when there were no adhesions,
sound and right; all the lung white, and free for the entrance of air,
except the base, in which was a cyst containing a pint or two of pus.
Loose in this pus was a hard mass, as large as a two-quart measure,
looking like marble; when cut through its centre, it appeared like the
brittle, hardened lining in case 1. It appeared as though a piece of
lung had been detached by suppuration and enclosed in an air-tight cyst,
by which decomposition was prevented. The other lung and the chest were
sound. It is to be inferred, as there were adhesions, that there had
been pleurisy and deposit of lymph and serum, as in case 1, and that
Nature had commenced the cure by absorbing the serum from the chest, and
the lymph from the free pleural surface, and smoothed off every thing to
a good working condition. The lump in the cyst was brittle and
irregular on its surface, as though it was dissolving in the pus. No
good reason can be given why Nature should not consummate the work which
she had so wisely begun.

Case 3.--This cow had been sick fourteen days; was coughing and
breathing badly; percussion dull over b