228 "Journal of Comparative Neurology and Psychology. 



squares Ei and E5, the stimulus was perceived as cold. The 

 four parts of the figure represent the sensations from the stimuli 

 which normally would be called cold (2°-10° C), cool (15°-22° C), 

 warm (30°-40° C.) and hot (45°-60° C). The lines running down- 

 ward from the left indicate sensation 'cold/ the lines running down- 

 ward from the right indicate the sensation 'cool/ the vertical lines 

 indicate the sensation 'warm/ and the horizontal lines indicate the 

 sensation 'hot.' 



With the lowest temperatures all the areas responded with some 

 form of sensation. The areas A, B and C reacted uniformly with 

 the sensation cold, and the square centimeter D5 also reacted in the 

 same manner. Once each, as has previously been mentioned, E2 and 

 E4 gave a feeling of cold, while in each of these squares two other 

 similar stimuli were reported to feel cool. With the next grade of 

 stimulus, cool, there was a wider distribution of cool feeling than 

 there was of cold feeling with the lowest temperatures, the areas 

 comprising A, B, C and 1), and of E and F the square centimeters 

 marked 4 and 5. 



The feeling of warmness was obtained over areas A, B and C 

 uniformly with temperatures from 30°-40° C, and in D the subject 

 reported a similar feeling but "only slightly warm." With stimuli 

 from 45°-C)0° C, areas A, B and C reacted always to the stimulus 

 as "hot," while areas D, E, F and G gave the feeling of warmth. 



Areas A, B and C are areas in which hot is distinguished from 

 warm and cold is distinguished from cool. Areas E, F and G are 

 areas in which only hot or crtld stimuli are invariably distinguished, 

 although area D5 reacted to cold, areas E2 and E4 reacted once to 

 cold, Dl — 5 and also E4, E5, F4 and F5 reacted to cool stimuli. 

 Area D reacted to warm stinuili with an appropriate reaction, but 

 the intensity of the stimulus appeared to be less than in the neigh- 

 boring area C. With the hot stimulus areas A, B and C reacted in 

 a normal manner, while the other areas reacted to the samje stimulus 

 with the sensation of warmth. It will be noted that in the area 

 in which the epicritic sensibility remained intact, coolness and cold- 

 ness and warmness and hotness w^ere always distinguished. This 

 comprised the horizontal sections, A, B and C. 



