10 



SENSE OF TEMPEKATURE. 



temperature at the same points of the skin or by the 

 same nerve-ends. The feeling of pressure seems to 

 be intimately associated with the hairs, which is not 

 the case with sensations of temperature. Even the 

 feelirjgs of heat and cold are also separate. These 

 three sets of points, indeed, are so near together that 

 the separation had hitherto not been observed, espe- 

 cially as they are closely intermixed. They have a 

 tendency, however, to arrange themselves in more or 

 less curved lines. Goldschneider experimented with 

 a fine point, which he passed over the skin, thus 

 testing it sometimes for pressure, sometimes with 

 a warm point for heat, sometimes with a cold point for 



^ 



Fig. 11.— Portion of the skin of the back of the hand (after Goldschneider). The 

 centre figure represents the arrangement of the hairs ; CP, the cold-points ; WP. 

 the warmth-points. 



cold. Moreover, if he raised the points thus determined 

 with a fine needle, and snipped off the fragment of the 

 skiu, he found that the resulting sensation was quite 

 different in the three cases. If the point removed 

 was a '' pressure-point " the sensation was one for the 

 moment of pain; while the temperature-points gave 

 one respectively of heat or cold. The terminations of 

 the temperature-nerves are, according to Goldschneider, 

 much finer than those of the pressure-nerves, and they 

 are also fewer in number. He cut out from his own 

 skin a large number of sensitive points, but, while he 

 found that each corresponded to a nerve-end, he has 

 not been able to discover any difference at or in the 



