he wall; d, conducting-wire
passing from the shoe; c', d', ends of the conducting-wires, which must be
imagined connected with the ends c', d', passing from the apparatus.]

It is unnecessary for our purpose here to minutely describe the exact
_modus operandi_ of these two experimenters. Briefly, the method of inquiry
adopted in each case was the 'push and contact principle' of the ordinary
electric bell, and the close attention which was paid to detail will be
sufficiently gathered from Figs. 35 and 36.

[Illustration: Fig. 36. I. LEFT FORE-FOOT SHOD AND MOUNTED TO RECOGNISE THE
SINKING OF THE SOLE. _a_, Iron plate covering the inner half of the horny
sole; _b_, openings in the same, with screw-holes for the reception of the
contact-screw _c_ (the part of the sole under the plate is covered with
tinfoil, which at _d_ passes out under the outer branch of the shoe, and
becomes connected with the tinfoil of the wall; in order to give the
freshly applied tinfoil a better hold, copying-tacks are at _e_ passed
through it into the horn, and one is similarly used to protect the tinfoil
at the place where the contact-screw touches the latter); _f_, holes
with screw thread for the fastening of the angle required to measure the
movement of the wall, and also for the fastening of the conducting-wire,
_g; h_, conducting-wire passing from the tinfoil; _i_, isolated nails.]

[Illustration: Fig. 36. II. BAR-SHOE WITH OPENINGS. _a_, Near the inner
margin and in the longitudinal bar; _b_, for the reception of the
contact-screw _c; d_, openings for fastening the angle and the
conducting-wires.]

After numerous experiments with the depicted contact-screws, moved to the
various positions indicated in the drawings, the following conclusions were
arrived at:

1. BEHAVIOUR OF THE CORONARY EDGE.--During uniform weighting of all four
hoofs the coronary edge shows a tendency to contraction in the anterior and
lateral regions of the hoof, and a tendency to expansion posteriorly. With
heavy weighting of the hoof, which is shown by a backward inclination of
the fetlock, contraction in the anterior and lateral regions is slight, but
the expansion behind, in the region of the heels, is distinct, commencing
gradually in front, becoming stronger, and diminishing again posteriorly.
The coronary edge of the heels becomes slightly bulged outwards. The bulbs
of the heels swell up and incline a little backwards and downwards.

When the fetlock is raise