98 
ZOOLOGY: S. R. DETWILER 
Proc. N. a. S. 
By counting the cell bodies in the third and fourth ganglia on the left 
(those connected with the normal intact limb) and comparing with the 
number counted in the corresponding ganglia on the right side, where the 
peripheral area was greatly diminished as a result of the limb excision, a 
cell ratio between the normal and hypoplastic development was obtained. 
Further, by counting the number of cells in the sixth and seventh ganglia 
on the left (normal) side and comparing with the number found in the 
Fig. 3. Drawing of a reconstruction model showing the sixth 
and seventh spinal ganglia which have no connection with a limb 
Fig 4. Drawing of a reconstruction model showing hyper tro- 
phied sixth and seventh spinal ganglia supplying afferent inner- 
vation to a transplanted limb 
right sixth and seventh ganglia, which contributed innervation to the 
transplanted limb, it was likewise possible to obtain a ratio between the 
normal and the hyperplastic development. A cell count was also made 
of the right and left ninth ganglia, which supplied homologous and undis- 
turbed peripheral areas, as a control for the hypoplastic and hyperplastic 
cell estimates. 
Having determined the cell ratios, the weight ratios were obtained by 
weighing and comparing the weights of unassembled paper models of the 
ganglia. The results of both computations (cell and weight) are sum- 
marized in the accompanying table. The extensive hypoplastic develop- 
ment of the right third and fourth ganglia resulting from the limb excision 
is readily seen, the total number of cells in each ganglion being less than 
