322 
here, that I moistened the spinal cord either too far or not far 
enough in a distal direction. If the last radicularis of a root is not 
likewise poisoned, then the field is a narrow zone too small in a 
distal direction, if, on the contrary, the proximal radicularis of the 
next following root is likewise poisoned, then the field is a narrow 
zone too large. We must consequently be mindful of these pos- 
sible errors, when judging of our dermatomes. When now the der- 
matomes of the hindleg had been marked with different colours on 
the skin, then the eat was killed. On a plastermould I indicated 
then the dermatomes again with paints of different colours and then 
the skin of the hindleg was finally prepared. The skin was then 
tanned and deposited. An exact description of the course of the 
limits of the dermatomes I had obtained, was made by me imme- 
diately after the expiration of the experiment. Thereupon I proceed- 
ed to the section. 
For this purpose the entire spinal cord, as far as the skull, was 
laid bare. The number of cervical, dorsal and lumbar vertebrae 
was counted. Counting from the skull [ traced which hindroots 
had every time be experimented. If | found deviations in the situa- 
tion of the fields pointing to prefixion or postfixion of the hindleg, 
or if the number of the different sorts of vertebrae deviated from 
the normal number, the plexus was laid bare and examined. Devia- 
tions of the plexus were marked, a scheme of the plexus was drawn, 
and usually the plexus was then extirpated, pinned to a waxplate 
and fixed in a solution of formol. 
In this way I obtained a representation on a plastermould of all 
the dermatomes I had determined, in such a way that the derma- 
tomes determined on one hindleg, were transferred to a plastermould, 
then I had the skins of the hindlegs on which the dermatomes were 
indicated, and at last an extensive description of the dermatomes. 
In this way l have determined the dermatomes of the left hindleg 
for 19 cats (I constantly took the left hindleg, as I had a plaster- 
mould of that hindleg, and it was of no consequence for my pur- 
pose on which hindleg | made my experiments). 
The skin of every hindleg | had experimented on, was always finally 
prepared in the same way. The sections of the skin that I executed 
for this purpose followed the same lines in every hindleg as much 
as was possible. | proceeded for this purpose in the following way : 
First | applied a circular section through the trunk skin, beginning 
from the 4" lumbar vertebra perpendicular to the vertebral column 
towards the ventral medianline. A second section follows from the 
place where the former section passes the ventral medianline, along 
