to surround the trunk of the animal with transparent paper, to 
transfer 
Still 
sensible 
( 310 ) 
the stripes on this paper and to preserve them. 
similar photographs as those directly counter-drawn from 
the negative in Fig. 11 and 12, reproduce with sufficient clearness 
an image of the fact, that towards the mid-dorsal line the analgetic 
areas (occasioned by the sectioning of two roots) above and be- 
neath the sensible area (dependent on one root left intact) are both 
of nearly equal breadth, whilst each of them is as broad as the 
area. 
Cranially. Caudally. 
Fig. 11. 
On 
Dog XV. 
the 15th of Sept. 1901 the 18th dermatoma is isolated on both sides by 
extradural sectioning of the 16th, 17th, 19th and 20th pair of roots. On Sept. 
16th, 1901 sensation ‘is determinated. On Sept. 17th the photograph is taken. 
The insensible (dotted) area is on both sides adjacent to the mid-dorsal line, 
and 
is equivalent to the sensible area cranially as well as caudally. dd = mid- 
dorsal line. 
ed 
4 ee 
‘ ore 
‘ 
ih - 
. 
Hes Cranially. 
ere a zi Samen Caudally, 
ve 
Fig. 12. Dog VIL 
Aug. 8th, 1901. The 16th, 17th, 19th and 20th pair of roots are cut 
through on both sides extradural. 
Of the 18th to the right, the first most cranially situated rootbundles are 
sectioned intradural in the posterior root. 
Of the 18th to the left, the most caudally situated rootbundles are sectioned 
intradural in the posterior root. 
On Aug. 9th sensation is determinated. On Aug. 13th the photograph is 
taken. Autopsy on Aug. 15th confirms that the four caudally situated 
bundels to the right !and the three most cranially situated bundles to 
the left are intact. 
Notwithstanding this, the insensible (dotted) area is nearly equivalent to 
the sensible area towards the mid-dorsal line, 
