124 S. AVALTER RANSON 



sibly be assigned. It should be noted that the assumption that 

 the tract of Lissauer and the substantia gelatinosa form an ap- 

 paratus for the reception and conduction of pain and tempera- 

 ture sensations, does not exclude the possibility that we are deal- 

 ing here with a center for vasomotor and pilomotor control, as 

 suggested by Sano. In fact, these autonomic functions are of 

 necessity closely correlated with the afferent impulses, which 

 find their conscious expression in the form of sensations of pain, 

 heat and cold. It is thus possible that the apparatus in question 

 has a double function, serving at the same time as a central 

 autonomic apparatus, and for the reception and conduction of 

 pain and temperature sensations. We offer these suggestions 

 in a most tentative way and without any attempt to support 

 them by arguments, giving them rather as problems for future 

 investigation than as conclusions to be drawn from the present 

 paper. 



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