745 
the total extent of the strychnine-segmentzone. Its limits have here 
likewise a parallel and perpendicular direction. On the lateral and 
ventral surface they assume also a distinctly converging course so 
that when they reach the ventral diameter, they are only 16 mm. 
distant from each other, whilst at the dorsal diameter the inner-zone 
is about 32 mm. wide. 
b. Description of the outer-limits of the outer-zone. (Total strych- 
nine-seymentzone). 
The cranial limit lies in the dorsal zone, scarcely perceptibly 
cranially from the cranial limit of the inner-zone. On the lateral 
surface however when the cranial limit of the inner-zone begins to 
converge, (consequently begins to move in a caudal direction), it 
deviates strongly diverging (consequently in a cranial direction). The 
outer-zone hereby becomes rather wide; at the v. d. it attains a 
width of 21 mm. The caudal limit of the outer-zone follows that 
of the inner-zone as far as the lateral surface, then about the place 
where likewise the cranial limits of outer- and inner-zone deviate 
from each other, it takes also a diverging direction (consequently 
follows a caudal course). In the level of the axil-groinfold line the 
outer-zone reaches its greatest width. From here it continues in a 
ventral direction pretty well perpendicular to the axis of the body. 
The caudal outer-zone is at the v. d. only 12 mm. wide. 
If now we cast a glance at the entire strychnine-segmentzone, i.e. 
both inner- and outer-zone, we obtain the impression, that the 
two zones by which it is formed (both inner- and outer-zone) show 
an inclination to shrinking. In favour of this view plead: 1. the 
stronger converging of the limits of the inner-zone towards the ven- 
tral diameter, which reminds us of W. and v. R.’s central area; 
2. the fact that the cranial outer-zone exceeds the caudal-zone espe- 
cially in the ventral region; 3. the disappearance of a distinct ‘‘ventral 
crossed overlap’; 4. the fact that at the d.d. the zone is as wide 
as the former (VIII Th.) and is here 34 mm., whilst at the v. d. 
the width is here 49 mm., consequently 6 mm. less. 
If we may admit here on these grounds a first beginning of 
shrinking, then we are struck by the fact that the zone undergoes 
this diminution exactly in its most excentric part, namely in the 
“ventral-crossed overlap’ and farther in the caudo-ventral region. 
In this way we obtain an insight into the manner in which the 
shrinking begins, and must observe then, that this shows conformity 
with what SHRERRINGTON and W. and v. R. saw already in their 
root-fields. 
