Franz, Sensations FolUnving Nerve Division. 217 



the forearm and hand, plucking individual hairs, and also brnshing 

 the hairs with cotton wool or with the light earners hair brush. The 

 results obtained on this patient are sufficiently different from Head's 

 reports to warrant a i-ather full description of the sensibility of 

 the hairs. 



Over the parts of the hand and forearm which are quite normal, 

 immediately a hair is touched there is felt a sensation, apparently 

 similar to that when the skin is lightly touched with a blunt in- 

 strument, such as a pencil. This sensation results, 1 find, from the 

 movement of the hair, and it is emphasized when more than one 

 hair is moved or when more than one hair is grasped with forceps. 

 After a hair has been tirndy grasped with forceps and slight traction 

 is exerted upon it, the sensation becomes clearer, or more intensive, 

 and when sufficient traction is exerted a distinct feeling or sensa- 

 tion of pain supervenes. The pain appears to differ in character 

 from that produced by extremes of pressure, as for example that 

 produced by an algometer, for it is rather burning in character. 

 Observations such as these Avere made by H. (the subject of the ex- 

 periments to be reported here) and b}^ me, and confinned by repeated 

 experiments at various sittings. 



On the other hand, as may be expected from the results of Head's 

 experiments, over parts which are not normal the hairs react in a 

 totally different fashion. On the \o\i\v side of H's forearm, near 

 the bend of the elbow, I marked off an area which included subareas 

 in which the different forms of sensibility were altered. First I 

 examined carefully the sensibility of the hairs to traction. I went 

 over the whole forearm and hand A\'herever hairs were found, and 

 marked in red ink a line between the area which was sensitive and 

 that which was insensitive to such stimulation. The hand and arm 

 were then photogTaphed and from the photograph was traced Fig. 1, 

 which is here reproduced. The area in which traction on the hairs 

 was not accompanied by a pressure-like or by a pain sensation is 

 that marked with vertical lines. The upper part of the arm, beyond 

 the ellK)w, I did not carefully investigate, for it seemed that some 

 of the change to be found there might be, and probably was, due 

 to the cutting of superficial skin nen'es both at the time of the accident 



