Vol. 6, 1920 
ZOOLOGY: S. R. DETWILER 
99 
half the number present in the corresponding left ganglia with the limb 
intact. This is also emphasized by comparing the weights of the ganglia, 
the weight of the right third and fourth being less than half that of the 
corresponding left ganglia. The cell and weight ratios as seen in the table 
show an interesting approximation. The hyperplastic development 
of the right sixth and seventh ganglia connected with the transplanted 
limb is seen by comparing the number of cells in these structures with the 
number present in the corresponding left ganglia. A ratio closely approxi- 
mating that of the cell count is shown by comparison of the weights. 
Fig, 5. Camera lucida drawing, showing serial sections of the sensory roots of the 
right and left third spinal nerve. The right root is greatly reduced in size as a result 
of excision of the right limb with which it is normally connected. X 40 
Although a cell count of the fifth ganglia is included in the table, the 
results have no comparative value since both supply nerves to a limb. 
The cell content of the right ganglion connected with the transplanted 
limb is seen to be slightly greater than that of the left ganglion connected 
with the normal intact limb. The cell and weight ratios of the ninth 
ganglion which were used for a control show only an inappreciable differ- 
ence which is well within the limit of error. 
The number of cells in a given ganglion was estimated by counting the 
nuclei. The diameter of the nuclei in many cases being greater than the 
thickness of the section (10 /x), a considerable number of cells must have 
been counted twice. The percentage error being the same, however, in 
