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the usual method of isolation and mine appears again how strong a 
diminution of the limited value of stimuli is obtained by strychnine. 
So far the facts. Now it seems not impossible to me to investigate, 
with the help of my results, somewhat closer some questionable 
points of the segmental innervation. 
Let us begin with the well-known so called “LANGRLAAN lines”. 
According to this author) one finds in the skin of normal persons 
hyperaesthetic lines and strings, which are said to exist in the inter- 
segmental limits. From my calculations of the overlaps it might 
follow on the contrary, that there is a better foundation for admitting 
this hyperaesthesy in those strips of skin where always three (at 
the d.d.) dermatomes overlap each other. These strips however do not 
lie intersegmental in the sense of two immediately succeeding zones, 
but exactly opposite to the axis of a rootfield. At the same time 
they form the so-called intersegmental limit of each third dermatome: 
From this may, at the same time, be concluded that the distance 
between two “LANGELAAN lines” does not amount to the width of a 
dermatome, but to half the width. At the v.d. the proportions are 
too complicated for an analogous interpretation to be ventured. 
For the much discussed territory of pigment-stripes of vertebrae 
the knowledge of the innervation-proportions of the skin, as it is 
now somewhat more detailed by the study of the strychnine- 
segmentzone, might prove useful. I have here specially in view 
the dark stripes of so many animals. SHERRINGTON’) has already 
called the attention to the fact that with zebra and tiger they seem 
to be segmentally arranged. Van RiJNBERK®) considers the dark stripes 
as an expression of the stronger innervation which in his opinion 
can be observed in the intersegmental limits. By the overlaps of the 
central area a “sunimation” of the innervation is supposed to exist. 
It is clear that to this view may be applied likewise what I said 
already above with regard to the “Langelaan-lines”. Then van 
RIJNBERK's excess-contrasts might be arranged in those strips where 
the extreme borders of the alternating dermatomes overlap one another. 
At last we may here fix the attention of the proportion in length 
of the short basis of the trapezium-shaped dermatome (in the d.d.) 
to that of the long basis in the v.d. This proportion is in Th. VIII 
1) J. LANGELAAN. On the determination of sensory spinal skinfields in healthy 
individuals. These Proc. of 2) Sept. 1909 Vol. III. 
2) C. S. SHERRINGTON. l.c. p. 737. 
3) G. VAN RiJNBERK De huidleekeningen der gewervelde dieren in verband met 
de segmentaalleer. Verslagen der K. Akademie v. Wetenschappen te Amsterdam, 
30 Sept. 1905. 
