( 1156 ) 
the case, covering also still a portion of the foot, either only the 
skin of the lateral toe or the whole of the lateral half of the foot. 
Winkier and vaN RiJNBERK found identical proportions for their 
dermatomata of J“. VII. As the average size of this strychnine- 
segmental-zone I think we may assume that where, both on the 
dorsum and on the sole of the foot, the skin of the two lateral 
toes is covered by its area. 
Fig. XXI reproduces the divers variations in extension of the L.VII 
zone on the foot as found in my experiments. 
S. I. According to the statements of WINKLER and vAN RIJNBERK, 
the dermatoma of SI is the first caudal marginal dermatoma, Le. 
the first of the caudal dermatomata of the extremity that has recovered 
the connection with the mid-dorsal and mid-ventral lines. 
The corresponding strychnine-segmental-zone behaves exactly in the 
same way. 
In as much as this zone extends over the proximal portion of the 
extremity, there is accordingly a fundamental difference between it 
and the preceding strychnine-segmental-zone. At the distal end of the 
extremity however the two zones are nearly identical as to shape and 
extension, though it may be taken for granted that generally the 
zone of SI is situated somewhat more on the posterior surface than 
that of £. VIf and does not extend as far distalward as this latter. 
For, in as much as I was able to state so from my material, the 
narrow tongue, protruding from this zone on the nether-leg never 
extends farther than unto tbe tuber calcanei. 
WINKLER and van RIJNBERK, who have isolated in 5 cases the 
Fig. XXIL. SI. Fig, XXIII. SI. 
