( 1457 ) 
dermatoma of S.1, stated in one of these*) (dog 11) that here the 
skin-field extended to the lateral toe. In the four remaining cases 
the distal boundary of the dermatoma was lying also between fossa 
poplitea and tuber calcanei. 
The strictly localized application of strychnine on the dorsal surface 
of the first sacral segment presents certain difficulties, not only 
because this portion of the spinal cord is rather wanting in length, 
but also, and this latter factor especially gives rise to obstacles, 
because the dorsal surface of this segment is almost entirely covered 
by the cauda equina, which is strongly developed in this region of 
the spinal cord. 
Still much worse those difficulties become in the more caudal 
segments of the sacral spinal cord, in these latter therefore there can 
be no question of precise localisation, and for this reason I have 
closed my series of experiments with the definition of the strychnine- 
segmental-zone of SI. 
We have now come to a summary of our results. 
The first strychnine-segmental-zone lying on the extremity is that 
of LI, for this zone is the first covering the greater part of the 
skin on the anterior crural surface. 
The zones of the segments / III and LIV resemble one another 
very closely, and though it cannot be denied that their conformity 
presents many individual variations, yet in a general way we may 
conclude that the caudal boundaries of these two strychnine-segmental- 
zones are nearly identical, and that this common boundary runs along 
a line, departing from the mid-dorsal line in the middle of the sacrum, 
and goes over the trochanter in the direction of the epicondylus 
femoris medialis. | 
The zone of the segment of ZL V is the first zone of the posterior 
extremity no longer connected with the mid-ventral and the mid-dorsal 
lines. WINKLER and vaN RiJNBERK, when stating the same fact for 
their dermatoma of LIV, call it therefore the first top-dermatoma, 
understanding by this name the dermatomata lying on the apex of the 
extremity, this latter considered as a cone with an obtuse top. 
The strychnine-segmental-zones of VI and Z VII have likewise 
lost all connection with the mid-dorsal and mid-ventral lines, whilst 
that of SI is again in coherence with both. These statements are in 
perfect accordance with those given by WINKLER and vAN RuNBERK 
for the corresponding dermatomata, as indeed we have remarked 
betore. When assuming therefore the terminology of those authors, 
1) WINKLER and van RiJNBERK, VIth Communication. 1. c. p. (304) 33. 
