48 Journal of Comparative Neurology. 



lene blue, this process is beaded or varicose and may be traced 

 almost into one of the nerves of the lobe. It would, therefore, 

 appear that this process is a central nerve-fiber. It may be seen 

 also that consecutive sections always reveal a nerve in the base 

 of the epidermis in the place occupied by several spiral organs 

 in previous sections. There is never any appearance of a nerve 

 passing to the central end of one of the pouches described in 

 the palp, but one is always found passing to one side of its peri- 

 pheral end. It seems that the central processes, in such a case, 

 must pass peripherally into the base of the epidermis before 

 entering a nerve. Everything indicates that these central pro- 

 cesses always enter epidermal nerves but I have never been 

 able to trace an individual process directly into a nerve. In 

 living material the surrounding tissues render this tracing diffi- 

 cult and in mounted methylene blue material, the spiral organs 

 are poorly preserved and have lost most of their stain. With- 

 out doubt these central processes in some regions of the body 

 pass to the same ganglionic centers that receive the central pro- 

 cesses from the diffuse sense-organs. The fact that they are, 

 in all cases, stained by the blue for only a short distance cen- 

 trally from the body of their cells would, I should judge, pre- 

 clude the possibility of any of the apparent pericellular nerve- 

 baskets found in these centers belonging to them. This does 

 not, of course, preclude the possibility that these central pro- 

 cesses also end in nerve-baskets — baskets unstained in my pres- 

 ent preparations. 



The second longer process from one of these cells is the 

 peripheral one first mentioned. This process is always much 

 stouter than the other processes from a given cell and enlarges 

 at its end into a club-shaped part which terminates in a highly 

 refractive body (Plate II, Figs. 41, 43 and 47). The peripheral 

 processes pass toward the surface and at the same time toward 

 the central tube in several small bundles and are generally at- 

 tached on their own side of the tube. Sometimes, however, a 

 single process, or even an entire bundle passes quite around the 

 central tube and is attached to its opposite side. Either just 

 before or just after enlarging into its club-shaped peripheral end 



