( 318 ) 
KEREN te ER oF a | - --E Gf ond, EERE >) RLR . wo EN 6 
Fig. 18. 
Regen ee ie hats es OS ol i ei een eee oy aa: 
oS Rea a Te Ee ln ee ee Se ot as inlet en oe ee el 
pag at LE+SY ee eae ER Gy” —« JE a Gey Nes LK + 34. 
Sensible 
A. The ranging of the dermatomata along the mid-ventral line. That part of the marginal area overlapping another central area, being 
called 2, and that part of the marginal area, overlapping another marginal area, being called y. (Represented for the special case of 
Dog 1 fig. 17). The central area is called 4. 
The sensible area from two dermatomata then is — two central areas + y = 24 + y. 
The analgetic area from two dermatomata = 2 central areas + 3y = Uh + 3y. 
If therefore on dog I the sensible area (3.2 cM.) is — } of the insensible area (6.5 cM.), then 2 > (24 + y) = (24 + 39) or 
y = 2k. Supposing always 2 not becoming larger than 4. 
B. Curve of sensibility traced above each dermatoma. The thick line represents the threshold line. 
C. The addition of the curves in B presenting a schema of sensibility along the mid-ventral line. From this schema the consequences 
of each sectioning of roots for the abdomen may be directly read; e.g. a when, as in the case of Dog I, two succeeding roots are 
cut through, the two following left intact, and then again two cut through. 
