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the ventral medianline in a caudal direction to a short way on 
the tail. Then I applied a third section, beginning from the interdi- 
gital fold between the 2nd and the 3'd toe, over the middle of the 
planta pedis and the calcaneus; then this section is continued over the 
middle of the bellies of the calfmuscles, through the fossa poplitea. 
Then the posterior rim of the upperleg is followed towards the 
symphysis in the direction behind the scrotum. A fourth section 
follows the dorsal medianline from the 4 lumbar vertebra to a 
little way on the tail. This section is united on the tail by a little 
transversal section, so that the ventral tailsection is hit at about 
1 em. distance from the spot where it begins at the insertion of the 
tail. The toes are successively peeled out by uniting the tops of the 
toes by means of sections following the middle of the webs. 1 shall 
begin by deseribing the dermatomes of the hindlegs of those cats 
with which I found no deviations at the plexus or the vertebral 
column. 
Without constantly mentioning the fact, we have, in the first row 
to do with the dermatomes of the hindleg of cats that were in 
possession of 7 cervical vertebrae, 13 thoracal and 7 lumbar vertebrae, 
whilst there was no deviation in the plexus (median-class according 
to LANGLEY). 
I shall begin by a description of the dermatomes of those cats 
with which the situation of the dermatomes does not deviate much 
from the average one. I use here expressively the word average and 
not normal, because it is my experience that there are not two cats 
to be found, with which the overlap of the dermatomes of the hindleg 
corresponds. The shape and situation of the dermatomes depends 
upon many factors, among which the level of the spinal cord on 
the spot where the hindleg develops itself, occupies a prominent place. 
This level of development ‘oscillates round an average and so does 
likewise the shape and the extension of the dermatomes. A deviation 
from this average of an entire segment can even exist. 
Cat 34 (4 Febr. (1916). 
The spinal cord in the lumbar-sacral: region is laid bare under ether chioroform- 
narcosis, the: dura is split lengthwise. The hindroot of lumbalis 3 is cut and 
the spinal cord moistened round the place of entrance of the hindroot of lumbalis 
4 with sulphate strychnin!: 1°/, (coloured with” methyleneblue). When the cat 
has awaked from the narcosis, the line of demarcation of the hyperflectory field 
is marked on the skin. 
Lumbalis IV. Anterior boundary. This proceeds from the dorsal medianline 
and runs 1 cm. behind the crista ilei in a somewhat caudal-distal direction to the 
groinfold, which is reached about the boundary between the posterior and the 
21* 
