138 S. R. DETWILER 
An examination of serial sections of cases 9 and 18 (table 2), 
preserved, respectively, sixty-four and sixty-six days after the 
operation, showed that in both cases the innervation was derived 
from plexuses formed by the fourth, fifth, and sixth spinal nerves 
(table 2). Although the limbs of this series were displaced 
posteriorly the distance of three segments, the segmental nerves 
contributing to the plexus were displaced by only one segment, 
so that the bulk of the innervation was derived from segments 
situated anterior to those corresponding to the position occupied 
by the transplanted limb. 
All of the shoulder muscles in case AS3, were found to be 
present (table 3), the coraco-brachialis muscle, however, being 
very short. All of the shoulder muscles were supplied with 
nerves. The shoulder-girdle was well formed except for a short 
suprascapula and a curtailed development of the coracoid (table 
4), the latter being a condition responsible for the brevity of 
the m. coraco-branchialis. 
In case AS3;s, muscular differentiation was also qualitatively 
complete, although the m. dorsalis scapulae and the m. procoraco- 
humeralis were quite short, due to an imperfect development of 
those parts of the girdle giving origin to these muscles, viz., the 
suprascapula and procoracoid. The remaining parts of the 
shoulder-girdle were typically developed (table 4). 
The m. latissimus dorsi received no nerve supply, resulting 
in an inability to the animal to draw the arm dorsoposteriorly. 
Defective innervation also of the m. triceps brachii resulted in 
partial extensor paralysis of the forearm. Other than these 
defects, peripheral innervation was complete. 
In general, initial reflexes in the transplanted limbs of this 
series did not appear quite as early, when compared with the 
normal, as did those in the series ASI and AS2, the period ex- 
tending from two to ten days after the first appearance of reflexes 
in the normal limb, although the number of cases in which there 
was only slight delay exceeded those in which the delay was 
greater. 
Series AS4. Transplanting the limb the distance of four 
segments posterior to its original position, so that the limb 
