194 Journal of Comparative Neurology. 



enced when the hollow organs are diseased. Schultz seems 

 not to be aware of the fact that sensory, cerebro-spinal nerves 

 have been traced into the epithelium of some of the hollow or- 

 gans. One of us has quite recently pictured such sensory end- 

 ings in the wall of the frog's bladder, where, with methylene 

 blue, they may be most clearly shown. And Smirnow has 

 pointed out the existence of sensory nerves in the walls of the 

 heart. We have no doubt that many of the larger medullated 

 fibers which accompany the sympathetic nerves to the viscera 

 will be proved to end in free endings in or under the epithelial 

 lining. We are, therefore, entirely in accord with Kolliker, 

 when he states that " Alle weit in die Peripherie entstrahlenden 

 markhaltigen Fasern, wie z. B. die in den Milz-nerven der Weid- 

 eskauer, im Gekrose des Darmes, in der Leber, u. s, w. bet- 

 rachte ich als sensible Elemente. " Attention needs further to 

 be drawn to the fact that Dogiel has quite recently described a 

 "second type of sympathetic cells" found in the ganglia of 

 Auerbach's and Meissner's plexus, which cells are spoken of as 

 sensory sympathetic cells. If we understand Dogiel correctly, 

 they are not regarded as of carrying sensations of pain to the cer- 

 ebro-spinal centres, but rather as functioning in local reflexes, 

 etc. Structurally, these cells differ markedly from those de- 

 scribed by Schultz as sensory sympathetic cells. The question 

 may here be asked whether the cells described by Schultz as 

 sensory sympathetic cells are not identical with the cells de- 

 scribed by Dogiel as the "cells of Ramon y Cajal ". Such 

 cells, Dogiel states, resemble very closely sympathetic nerve 

 cells, and stain very readily in methylene blue, and are, if one 

 may judge from Fig's. 5 and 6 of his article, very numerous. 

 These cells are described by Dogiel as having varicose processes ; 

 he was however unable to find processes not beset with vari- 

 cose enlargements, and not branching. It is true, he adds, and 

 we give here his own words, " Dass zuweilen irgend ein Fortsatz 

 in Vergleich zu den iibrigen feiner erschient, mit einer grossen 

 Anzahl Varicositaten besetzt ist und gewissermassen an einen 

 Axencylinderfortsatz erinnert. AUein ein solcher Fortsatz 

 unterscheidet sich dadurch scharf von einem wirklichen Axen- 



