In connection with this subject, Professor Hobday has published, among
others, the following cases illustrating the practical value of this method
of diagnosis:[A]

[Footnote A: The _Journal of Comparative Pathology and Therapeutics_ vol.
viii., pp. 27, 43.]

CASE I.--Cab gelding. Seat of lameness somewhat obscure; navicular disease
suspected. Injected 2 grains of cocaine in aqueous solution on either side
of the limb, immediately over the metacarpal nerves.

_Five Minutes_.--Lameness perceptibly diminished.

_Ten Minutes_.--Lameness scarcely perceptible.

CASE II.--Mare. Obscure lameness; foot suspected. Injected 30 minims of a 5
per cent. solution on either side of the leg just above the fetlock.

_Ten Minutes_.--No lameness, thus proving that the seat of lameness was
below the point of injection.

CASE III.--Cab gelding, aged, free clinique; Messrs. Elme's and Moffat's
case. Obscure lameness; foot suspected of navicular disease; very lame.
Injected 30 minims of a 5 per cent. solution of cocaine on either side of
the leg over the metacarpal nerves.

_Six Minutes_.--Lameness perceptibly less; there was no response whatever
on the inside of the leg to the prick of a pin. On the outside, which had
not been injected so thoroughly, there was sensation, although not so much
as in a healthy foot.