142 S. R. DETWILER 
The shoulder-girdle was quite typically developed for the 
heterotopic position, its only defect being a slightly reduced 
procoracoid and a short, thick suprascapula (table 4). 
Reflexes in the majority of the transplanted limbs of this 
series began at different periods ranging from fifteen to twenty- 
six days after the operation, the majority of the limbs beginning 
to function about the eighteenth or ninetheenth day; in other 
words, about four or five days after the first appearance of reflexes 
in the normal limb. 
Series AS5. When the limb buds were transplanted the 
distance of five segments posterior to the normal position so that 
they centered ventral to the ninth somite, 63 per cent developed 
reduplicated appendages, there being only eleven cases in thirty 
positive experiments which developed into normal limbs (table 
la, series AS5). The limbs of this series showed a still greater 
decrease in function than did those of the series AS4. Although 
there were twenty cases in thirty which could be classed in the 
category of functional limbs, only four cases functioned perfectly 
(table 1a). Of this series of experiments five cases were sectioned 
and studied. The segmental nerve contribution to a number of 
cases of this series is shown in table 2. Although some variability 
in the segmental contribution is noticeable, it is also seen that, 
as in the series previously described, the bulk of the innervation 
comes from segments of the cord situated anterior to the position 
of the limb itself. The limb, although centering ventral to the 
ninth segment and extending over into the region of the eighth 
and tenth segments, receives no innervation from the latter 
segments of the cord. 
Of the individuals sectioned, case AS5,; (figs. 16 and 17) was 
the only one which exhibited perfect function. It is also found 
by an examination of table 2 that this was the only case of those 
sectioned which received innervation from the fifth segment, 
which, as has hitherto been shown, belongs to the normal limb 
level. Figure 11 represents a graphic reconstruction of the nerve 
plexus supplying the transplanted limb. Although the limb 
receives innervation from five segments, the bulk of the nerve 
fibers come from the fifth, sixth, and seventh segments of the 
cord. 
