(269) 
Supposing the animal to be cut open along the mid-ventral-line 
and the skin from the right half of the body bent to a level, in such 
a manner that the mid-ventral line is situated to the right, then the 
form of the ideal dermatoma isolated by SHERRINGTON may be repre- 
sented in the manner indicated by fig. 
What exceeds the mid-dorsal (d) and mid ventral (v) lines then sig- 
nifies SHERRINGTON's crossed overlapses. This ideal form however is 
never to be met with in dogs, when a trunk-dermatoma is isolated 
in the manner indicated by SHERRINGTON, by cutting through two 
or more roots above and beneath the root which is left intact. 
The results obtained in this way were not always the same. What 
follows here gives an account of them. 
The isolated sensible (arched) between two insensible (dotted) area’s showing 
an important narrowing of the ideal dermatoma-area. 
1. Between two insensible area’s, there may continue to exist a 
sensible area, broadest towards the mid-dorsal-lne and narrowest at 
the mid-ventral-line and therefore much smaller than the ideal der- 
matoma-area, and different in form. (fig. 2). 
fig. 3. 
Further narrowing of the sensible dermatoma-area. 
