( 1158 ) 
we may say that on the hind-leg there ought to be distinguished 3 
cranial marginalstrychnine-segmental-zones, viz. those of LI, £ HI, 
and LIV, 3 apical strychnine-segmental-zones, viz. those of LV, 
LVI, and £ VII, and at least 1 caudal marginal strychnine-segmental 
zone, viz. that of SI. 
According to WINKLER and van RIJNBERK, the dermatomata of SII 
and SIII are still caudal marginal dermatomata of the posterior 
extremity, these two being then the last. As we told before, it is 
impossible to obtain a strictly localized strychnine-application on these 
segments, for which reason [ have not determined their corresponding 
strychnine-segmental-zones. 
When examining Fig. XXII, we may see that the cranial boundary 
of the strychnine-segmental-zone of STI leaves the mid-dorsal line at 
the centre of the sacrum and passes over the trochanter, directed 
towards the epicondylus medialis, changing then its direction some- 
what distally from the trochanter and bending to the posterior surface 
of the extremity. 
For the common caudal boundary of the zones of LIL and LIV 
we could state an identical course, at least unto a point somewhat 
distally from the trochanter. In this case therefore the strychnine- 
segmental-zones of segments not immediately succeeding one another 
in the series are bounded by one another. 
WINKLER and van RiJNBERK found wholly identical relations for 
their dermatomata, and design therefore this demarcation-line between 
skin-fields that originally are not bounded by one another as the 
“dorsal axis-line’” (SHERRINGTON) or the “dorsal differential boundary” 
(Bork) of the extremity. 
On the ventral side and the medial surface of the posterior extremity 
we find the following relations : 
The caudal boundaries of the strychnine-segmental-zones of £ II, 
Liu, and LIV run along the same line for a large part of their 
course; it may even be said nearly that the ventral portions of these 
zones entirely cover one another reciprocally. 
Although the lack of fixed points on the abdomen and the medial 
crural surface (the nipples may on no account be regarded as such) 
is a cause why the course of the zonal boundaries cannot be defined 
as sharply as on the extremity, yet we make a very near approach 
to expressing the genuine relations, when saying that the common 
caudal boundary of the Z II, Zl and LIV strychnine-zones is formed 
by a line departing from the symphysis in the direction of a point, 
situated on the medial surface of the extremity nearly in the middle 
between epicondylus femoris medialis and fossa poplitea. The caudal 
