ening at the coronet.'[A]

[Footnote A: W. Willis, M.K.C.V.S., _Journal of Comparative Pathology and
Therapeutics_, vol. xv., p. 366.]

2. 'The subject of this note was a chestnut mare, nine years old, and used
for omnibus work.

'_History_.--For about two months the mare was lame on the off fore-leg,
and in spite of treatment the condition became steadily worse. The off
fore-foot was rather long and narrow, and the fetlock-joint was inclined
to be bowed outwards, but the degree of lameness was out of proportion to
these defects, and the diagnosis was obscure.

'Median neurectomy was performed on May 10, 1902, and reduced the lameness
to about half of what it was before. On June 5 ulnar neurectomy was
performed, with the result that the mare became sound, and went to work
three weeks later. She continued to work soundly and well, being inspected
from time to time.

'During February of 1903 the coronet began to enlarge in front and slightly
to the outer side, and gradually a ridge of bone grew down from the coronet
to the toe. The case, in fact, became a typical one of so-called "buttress
foot," which my friend Mr. Willis has described as diagnostic of disease
of the pyramidal process of the pedal bone. Meanwhile the swelling of the
coronet, which appeared to be mainly composed of fibrous tissue, increased
in size, until the whole of the front and sides became involved, assuming
the appearance shown in Fig. 156.

'In spite of the coronary enlargement the mare worked well, and remained
free from lameness till June 8, 1903, on which day the limb became swollen
up to the site of the median operation. The appearance of the limb closely
simulated an attack of lymphangitis. The mare was kept under observation
till the 13th of the same month, during which time the swelling increased,
as did also the lameness to a slight degree. During progression she brought
the heel to the ground and "rocked the toe," as in a case of rupture of the
perforans tendon. The mare was killed on June 13.

[Illustration: FIG. 156.--A CASE OF BUTTRESS FOOT.]

[Illustration: FIG. 157.--FRACTURE OF THE PYRAMIDAL PROCESS IN BUTTRESS
FOOT.]

'_Post-mortem_.--In trying to pull away the hoof from the sensitive
structures with a pair of farrier's pincers, the tendons and ligaments of
the corono-pedal articulation gave way, leaving the pedal bone _in situ_.
The flexor perforans tendon showed inflammatory softening, and was very
nearly ruptured throug