(517) 
LEFT ShDE 
Measurings. Mid-dorsal line. Largest breadh Mid- 
of central area. ventral line. 
Measurings on Jan. 15th Febr.2d Jan. 15th Febr.2¢ Jan. 15th Febr, 2d 
Cranial analgetic area Interrupted Interrupted 
(2 roots) 1.9 e.m. 1.4 e.m. (over 6 c.m.) (over9c.m.) 4.8¢.m. 5.2 ¢.m 
sensible area (1 root) 38 , 4 , OL ee Li gba 5 RS pets 
teen am tA Ge i je 2, GEen Gr as AN 
On Febr. 2d the distance from the mid-dorsal to the mid-ventral line is 23 cm. 
in the cranial, 24 cm. in the caudal area. 
The top of the anterior dorsal triangle is lying at 3.2 ¢.m. distance from the 
mid-dorsal line, the top of the anterior ventral triangle at 14 c.m. distance from 
the mid-ventral line. The breadth of the interrupting band is 9 c.m. 
The top of the posterior dorsal triangle is situated at 55 c.m. distance from the 
mid-dorsal line, the top of the posterior ventral triangle at 16 c.m. distance from 
the mid-ventral line. The breadth of the caudal interrupting band is 2 c.m. 
Ogservarion VII. A black male dog (Series Il, No. III). On Dec. 31th 1901, 
under aseptic conditions, are cut through extradural: to the right the 11th, 12th, 
14th, 15th, 17th and 18th pair of roots, to the left the 11th, 12th, 16th and 17th 
pair of roots. The autopsy on Jan. 2d confirms that this has been the case. On 
Jan. 1st the hindlegs of the animal are paralysed. 
Fig. 27. To the right the 13th and 16th roots are isolated, both between two 
sectioned roots on each side. To the left the 13th, 14th and 15th 
roots have been preserved intact between two sectioned roots above 
and below these three. 
On Jan. 17st the sensibility is determined. To the left, although two roots have 
been cut through, there is only found cranially a ventral analgetic spot, offering 
again a triangular form. To the right the most cranially situated sensible area, 
has pierced on both sides the neighbouring analgetic areas. On the contrary the 
most caudally situated sensible area is very considerably narrowed, even half of it 
being interrupted by the caudal analgetic area. 
From these observations it becomes clear, that under favourable 
conditions, the isolated central areas not only reach their largest 
