( 339 ) 



having loosened them from the adjacent blood-vessels thai mostly 

 follow the same course, or else together with (he bloodvessels 

 between a double ligature. The skin was then skitched and the 

 animal was allowed a few days quiet. After this the sensible and 

 the insensible areas to be found in the skin were defined and their 

 boundaries carefully indicated by means of coloured demarcation- 

 lines. Finally the animal was again brought under narcosis, the 

 incision in the skin was reopened and the isolated nerves were laid 

 bare and stimulated. The area-field, on which the hair was rising, 

 was demarcated by another colour. 



Fig. G. 

 Pilomotor area of the 7 t '> thoracal nerve. 



Fig. 7. 

 Pilomotor area of the 8<'< thoracal nerve in the same cat. 



As regards the pilomoter nerves I can be short, as I have hardly 

 anything to add to the very accurate communications of Langley 

 tui this subject. Like him I found in my experiments that the 

 areas in which during the irritation of different skin-branches 

 and on different animals the hair rose, showed rather important 



