PARALYSES IN DOGS Likes 
Experiment 70. Lesion March 18, 1910. On July 20 residual spas- 
tic paralysis (fig. 18) of both legs. On this date operation similar to 
that done on dog 65. The immediate result was flaccidity of homolateral 
paw. December 8, 1910, all roots which were involved in the fusion 
sear divided and stimulated under ether. Leg movements evoked on 
side of fusion, similar to those on other side. Popliteals stimulated and 
responded to weak currents. Animal sacrificed. 
Anatomic report: At region of fusion dense sear containing partially 
myelinated fibers. Peripheral to sear, roots show myelination better 
advanced. 
Experiment 73. Lesion March 19, 1910. On July 8, 1910, residual 
paralysis (fig. 24) confined to tail. On this date operation similar to 
that done on dog 68. In September dog was wagging tail pretty well 
and seemed to have more strength in it. On December 20, 1910, all 
roots below fusion divided and stimulated, under ether, and tail responses 
evoked. Animal sacrificed. 
Anatomic report: Region of fusion showed dense, knotty scar infil- 
trated with nuclei, also a few fascicles of good fibers and some partially 
myelinated fibers interwoven among the cells. At more caudal levels 
regeneration quite advanced. 
Experiment 75. Lesion April 12, 1910. On July 12, residual spastic 
paralysis (fig. 16) of right leg, except for paw which was flaccid. On 
this date operation on right anterior roots similar to those done in dogs 
65 and 70. Clinical result completely negative. Death by accident, 
November 20, 1910. 
Anatomic report: In region of fusion, dense scar containing some faintly 
myelinated fibers. 
Experiment 78. Lesion April 15, 1910. On August 22, 1910, resid- 
ual paralysis (fig. 8) chiefly of right external popliteal. On this date 
following operation: external popliteal divided and fused to internal 
popliteal low down. Dog found dead, October 10, 1910. 
Anatomic report: Right sciatic above fusion contained increased con- 
nective tissue spaces. At region of fusion dense scar with numerous 
nuclei. New nerve fibers among these running in all directions. Some 
regeneration in nerves below fusion. 
Discussion 
In the three dogs (Experiments 64, 78 and 69), in which the 
popliteals were fused, there was no functional gain, although 
there was anatomically some regeneration in all the nerves below 
the scar. In one of these (78) death occurred before any func- 
tional result could be expected. In dog 69 where the sciatic was 
sectioned higher up and the stumps failed to unite, the peripheral 
stump must have made new central connections through small 
fibers injured in the wound during the operation. The stim- 
