artling difference in
the incidence of degeneration explicable. In this relation we may bear
in mind that the muscles supplied by this nerve suffer most in the
degeneration subsequent to anterior polio-myelitis, and again that in
cerebral hemiplegia or spinal-cord injuries they are the last to
recover. Unfortunately no explanation of these remarkable facts, so
forcibly impressed by the large series of cases with peroneal symptoms
seen in a short time, is forthcoming.

I may dismiss the other branches of the sacral plexus in a few words.
The small sciatic was occasionally injured in its course in the buttock,
and the small saphenous in the leg. When either element of the latter
was injured, it was surprising how sharply the imperfections in the
anaesthesia corresponded with the composite character of the nerve.

CASES OF NERVE INJURY

The following cases are added mainly to give some idea of the
comparative frequency with which the individual nerves were injured, and
also to exemplify the more common forms of complex injury met with.
Circumstances, unfortunately, did not always allow of extended
observation at the time, and I have not been very fortunate in my
attempts to obtain subsequent information on this series since my
return. A certain amount of prognostic information is, however,
furnished by some of the records, and I am very much indebted to my
colleague, Dr. Turney, for help in this matter.

(118) _Brachial plexus._--_Entry_, 2 inches above the clavicle
at the anterior margin of the trapezius; _exit_, first
intercostal space, 1 inch from the sternal margin. Heavy dull
pain developed at once, extending down the upper extremity. A
fortnight later this pain still persisted; there was lowered
sensation in the ulnar area with formication, also lowered
sensation in the internal cutaneous area of distribution;
sensation in the lesser internal cutaneous area was normal. The
patient went home with the nerve symptoms well at the end of a
month.

(119) _Brachial plexus injury._--Wounded at Magersfontein.
_Entry_, at the anterior border of the sterno-mastoid opposite
the pomum Adami; _exit_, through the ninth rib below and 1/2 an
inch external to the scapular angle. Emphysema and considerable
blood extravasation developed in the posterior triangle of the
neck, also loss of power in the musculo-spiral distribution,
but no anaesthe