202 KANSAS UNIVERSITY QUARTERLY. 



my experiments served only to confirm the theory of former 

 writers, viz., that the end-organs are not situated in the epidermal 

 layer. Experiments with abnormal growths of the skin indicated no 

 temperature nerves in the wart, but both heat and cold spots in the 

 hair mole near the follicles of the hair. 



The instrument which I used in making the experiment is similar 

 to the tube described by Donaldson in his description of Prof. Hall's 

 kinesmeter. It consists of a hollow glass tube with a slightly project- 

 ing platinum wire in the closed end. The tube is filled with water, 

 the temperature of which is registered by a suspended thermometer. 



While making the above experiments the question occurred to me 

 whether climatic or racial distinctions would show any perceptible 

 difference in the number of the temperature end-organs, or whether, 

 as has been asserted, the end-organs themselves became more or less 

 anaesthetic or hyperjesthetic, according to climatic conditions. 

 With a desire to throw some light upon the question, I began a series 

 of experiments, the results of which are recorded below. 



The experiments were made on the left lower arm of the subject 

 between the anterior ulnar vein and the median vein upon a space 

 one and one-half centimeters by two centimeters, with the instrument 

 described above. I first noted the number of cold spots, next, the 

 number of heat spots, and then the number of spots where the sub- 

 ject made no distinction betwen hot and cold, but would call "hot" 

 for the cold instrument and vice versa. 'Jliese spots I have called 

 neutral-spots. The number of radial centers mentioned above were 

 noted also. Considerable care was given in the majority of cases, 

 and the space gone over again and again. 



My first experiments were with members of the 



Caucasian Race. 



Subject No. I, b. in Kansas 31 



" "2 " Kentucky . . . 



" "3 " New York. . . 



Average No. in i, 2 and 3 30 15 3^ 2^ 



Subject No. 4 was paralyzed in left arm. Total analgesia, and 

 anaesthesia. Very slight sensation in what might have been the radi- 

 al-centers. Less sensitive to heat than cold. Slight anaesthesia of 

 heat-spots found in No. 2, and hyperesthesia in No. 3. 



