(511) 
RIGHT SIDE 
Largest breadth 
Measurings. Mid-dorsal line. of central area. Mid-ventral line. 
Cranial analgetic area (2 roots) 2.7 c.m. 2 cm. 5.3 ¢.m. 
Sensible area adie A + 7.5 WER 207 
Caudal analgetic area (2roots) 3 ¢ interrupted (0 or —) 45 , 
The interruption of the right caudal analgetic area occurs on 8.7 c.m. distance 
from the mid-dorsal and on 12 e‚m. distance from the mid-ventral line, and pos- 
sesses a breadth of 15 c.m. 
EAE SST Di Ee 
The analgetic triangle, adjacent to the mid-ventral line has a breadth of 3.2 cm. 
Its top is situated at 3.8 c.m. distance from the mid-ventral line. 
Oxservation III. Young black male dog. (Series Il, No. 1). On Dec. 17th 1901 
under rigorously aseptic conditions the 14th, 15th, 18th and 19th pair of roots 
to the right and the 16th and 17th pair of roots to the left, are sectioned extra- 
dural. The autopsy on Jan. 2d 1902 confirms that this has been the case. 
The results of the determination of sensibility on Dec. 19th are somewhat 
different from those on Dec. 22th, the latter being rendered in fig. 22. 
Fig. 22. The 16th and 17th dermatoma 
to the right isolated between two sectioned roots. 
Here too the caudal analgetic area is interrupted, it does not reach the mid 
dorsal line, because the sensible left half of the body exceeds this line below the 
caudal end of the wound. The right sensible zone exceeds the mid-ventral line, 
where it is encompassed by the analgetic interrupted band on the left side. 
RIEGHTST DE. 
Mid-dorsal Largest breadth 
Measurings. line. of central area. _Mid-ventral line. 
Cranial analgetic area (2 roots) 2.5 c.m. i.2 dm; 6.2 c.m. 
Sensible area ke E.G. >= + 7 2 ou de 
Caudal analgetic area 2.7 „ interrupted (Oor —) LS ee 
The place of interruption is situated at 8.5 c.m. distance from the mid-dorsal 
line and at 13.6 c.m. distance from the mid-ventral line, and has a breadth of 2 c.m, 
34* 
