116 HENRY O. FEISS 
Anatomic report (In this and the following experiments, sections were 
stained by Weigert-Pal and general methods): Left sciatic above scar 
showed normal fibers and some unusual patches of connective tissue. 
Sections through midst of neuroma showed many small, and partially 
myelinated fibers some in bundles and others scattered among the cells 
of the scar. Scar dense and contains numerous nuclei. Popliteals 
below scar show scattered fibers with large interspaces and myelination, 
although not complete further advanced than in sear. Some large 
areas where no fibers appear suggesting that sheaths emptied by lesion, 
have not been filled. 
Experiment 65. Lesion, January 19, 1910. On April 28, 1910, 
residual paralysis (fig. 14) chiefly of left leg. On this date, following 
operation: 6th and 7th arches removed, dura opened, cauda exposed. 
Sensory roots lifted aside and such motor roots as lay in the field stim- 
ulated. No response except in tail. Motor roots fused with one cat- 
gut ligature and crushed with haemostat. Dura sewed. Wound closed 
tight. No clinical improvement noted after operation. On September 
26, 1910, stimulation of roots attempted with doubtful results. Ani- 
mal sacrificed. 
Anatomic report: Partial disappearance of anterior roots at region 
of fusion. Some scar with only a few nerve fibers interwoven in it. 
Roots peripheral to scar show greater numbers of fibers and myelination 
further advanced. 
Experiment 68. Lesion, March 17, 1910. On June 10, 1910, resid- 
ual paralysis (fig. 22) chiefly of tail and slight weakness of dorsal flex- 
ion of right paw. On this date following operation: 6th lumbar arch 
removed and all sacral and coccygeal roots (both anterior and posterior) 
constituting cauda at this region, fused with two cat-gut lgatures. 
No change noted after operation till in September or October, when tail 
seemed to be moved better (figs. 26 and 27). Thereafter but little gain. 
On November 30, 1910 (173 days after fusion), all roots divided and stim- 
ulated peripheral to fusion-neuroma and found to evoke tail movements. 
Animal sacrificed. 
Anatomic report: Place of fusion shows dense and knotty scar with 
large numbers of cells running in all directions. Among these, small 
and partially myelinated nerve fibers have formed. Roots peripheral 
to scar contain fibers better myelinated, some almost normal. 
Experiment 69. Lesion, March 17, 1910. On July 18, residual par- 
tial paralysis (fig. 12) of muscles supplied by right external popliteal. 
On this date following operation: right sciatic divided above bifurca- 
tion and immediately resutured. Then popliteals fused by usual method 
with two cat-gut ligatures. (The object of the division was to promote 
fibrillation at the cut end of the central stump, before the fibrils entered 
the region of fusion.) Clinically dog became worse after the operation. 
On December 19, 1910, nerves investigated under ether and the cut ends 
of the sciatic were found ununited. Yet stimulation of popliteals below 
neuroma evoked responses. Animal sacrificed. 
Anatomic report: Popliteals in fair states of regeneration. 
