Franz, Sensations Following Nerve Division. 221 



above the lowest line on the diagram, Fig. 2. It will be noticed, there- 

 fore, that the fifteen square centimeters embraced in the horizontal 

 areas E, F and G were sensitive to this form of stimulation but not 

 sensitive to the stimulation of traction. 



"\\n3en this large area was shaved, it was found that stimulation 

 of the skin w^ith cotton wool or with a camel's hair brush was ac- 

 companied by sensation only in the horizontal subareas A, B and 

 C. In these same areas other forms of epicritic sensibility, e. g., 

 the appreciation of two-ness, were also present. 



nodius 



E 



Fig. 3. 



Fig. 3. — Back of forearm near wrist. Horizontal area A, loss of all forms 

 of sensibility. Area B, hairs do not resi)ond to cotton wool or to traction. 

 Area C, hairs react to cotton wool, not to traction with pain sensation, but 

 with only pressurelike feeling. Areas D and E, hairs react to cotton wool 

 and to traction. Area E, brushing hairs and traction on them felt more 

 plainly than in any other areas. Area D and radialwards, area in which 

 epicritic sensibility retained. 



This unexpected result on the upper part of the arm led me to 

 a further examination of another section of the arm ten days later. 

 The second axea was on the outer and ulnar side of the forearm 

 beginning about 8 cm. from the fold of the wrist and extending up 

 the arm a distance of 5 cm. This part of the arm is shown in 

 Fig. 3. Area A in the figure is the area insensitive to pressures. 

 Area B is separated for convenience, but experimentally not shai*ply 

 to be distinguished, from area A and is that part of the arm in which 

 pressures usually, but not always, wore felt. The wavy line separates 



