342 
MR. E. P. FRANCE ON DEGENERATIONS WHICH FOLLOW LESIONS 
Dorsal Regio'ti.-^TliQ degeneration here is more triangular than in cases of simple 
marginal lesion, and more extensive. It does not reach cj^uite so far forward as in the 
cervical region, but is nearer the circumference of the cord ; so that in this part (middle 
dorsal) there is only a narrow and irregular band of healthy fibres left in the position 
of the direct cerebellar tract. The degeneration seen in the cervical region, extending 
along the circumference of the cord, here disappears. 
Lumbar Enlargement. —The degeneration is confined to the angle formed by the 
posterior cornu and the circumference; it is much smaller than in the dorsal region, 
but more extensive than with simple marginal lesions. 
Case 8. — No. 37 of First Sei'ies. (Figs. 3(X, Plate 27, and 36, Plate 28. See also 
‘Phil, Trans.,’ B, 1888, Plate 6, figs. 37b to 37e.) 
Lesion 1.—The anterior part of the left gyrus fornicatus was removed. 
Result. — The external ear of the opposite side gave no reaction to tactile impressions 
producing pain elsewhere ; it could not be determined whether any other parts were 
completely insensible. 
Lesion 2.—A week after the fii’st operation, the greater part of the remainder of the 
convolution was cut away (see fig. 3a). 
Frontal sections through the marginal convolution and gyrus fornicatus show that 
that part of the gyrus fornicatus which borders on the corpus callosum has remained 
almost uninjured, whilst, on the other hand, that part of the marginal convolution 
which borders on the calloso-marglnal fissure is injured in two places (anteriorly and 
posteriorly). 
Result. —Great diminution of sensibility over the right side ; tactile impressions 
produced no reaction ; painful impressions were slowly perceived, and not localised. 
Tins “ allochiria” began to be exhibited about a week after the second operation ; it 
alterwards disappeared. No paresis was observed. 
The animal was killed three months after the first operation. 
Degenerations Observed. 
Degeneration is distinctly seen with the naked eye in the pons and medulla 
(pyramid) on the left side, and in the spinal cord, as far as the lower lumbar region in 
the crossed pyramidal tract, on the right side, involving also the direct cerebellar tract 
on the same side to a considerable extent. 
Midbixiin and Rons. —In the pyramidal bundles of the left side scattered degenera¬ 
tion is visible with the microscope ; it is not so great in amount as in the pons of 
No. 6, but, on the other hand, the cerebral lesion in this case is not so extensive. 
Medidla. — Scattered degeneration is distinctly to be seen in the left pyramid. 
There is well-marked sclerosis, besides degenerated nerve fibres. 
Spitial Cord. Cervical Region .—There is degeneration in the crossed pyramidal 
