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A Human Experiment in Nerve Division
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wool, or deformations of the skin, produced by drawing the hair outwards caused absolutely no sensation.


(b) In spite of the existence of this sensibility, two compass-points could not be distinguished, even when separated by 8 cm.


(c) All sensation was lost to cutaneous painful stimuli, and to heat and cold. In fact, the condition might easily have been mistaken for one of analgesia and thermo-anaesthesia with intact sensibility to touch.


(d) Between the extent of the analgesic area and that insensitive to cotton wool, lay a border where the prick of a pin was abnormally painful.

Fig. 2: To show tho extent of the loss oE sensation twenty-one days after the operation (May 16, 1903). The black line encloses the loss to cutaneous tactile stimuli; the red line encloses the cutaneous analgesia. Wherever these lines are broken the border was an indefinite one.

(e) None of the cold-spots marked out before the operation reacted to the usual stimuli.

"The whole of the affected area is of a slightly deeper red than the rest of the skin of the hand. It is dry, and covered with minute hairlike scales. On palpation, the skin appears to be thickened and looks as if it were slightly oedematous; but it does not pit on pressure. A

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