BY J. T. WILSON AND C. J. MARTIN. G75 



away from its investing layers of cells in this position in some few 

 specimens, l)ut the follicle figured by us does not illustrate this. 

 Poulton then continues — ^" Below, this sheath forms the outer 

 part of the bulb, and is separated from the inner part by a space 

 containing small branched cells, the nature of which could not be 

 determined in my material." These branched cells are figured by 

 Poulton in his fig. 8 sp. We have never seen in any of our 

 specimens an appearance approaching that described by Poulton; 

 the sheath of the follicle formed from the general epidermis being, 

 as we have above described, alwa3^s in contact with the polyhedral 

 cells (figs. 2 and 6, jA- 



We now come to a part of Poulton's paper with which our 

 observations are entirely at variance, but it is only just to state 

 that Mr. Poulton is himself of opinion that his material was not 

 adequate and that "the whole structure of these hair-like epidermic 

 cylinders, and the nervous tissues evidently associated with them, 

 is so remarkable and complex that the fresh tissues are required 

 for their satisfactory elucidation and f<jr the discover}' of the 

 nerve terminations which we must believe to exist in connection 

 with the apparatus." 



Poulton is quite right in describing the bulb as being invariably 

 associated with numerous medullated nerve fibres, but we have 

 never seen any appearances that would justify one in considering 

 the terminations of these fibres as ganglion cells as he does. They 

 do indeed terminate in bulbous expansions of the axis-cylinders, 

 but not in ganglion cells. No doubt, too, Poulton's specimens did 

 not enable him to see that large numbers of these expansions of 

 the axis-cylinder are situated within the outer sheath of the 

 cylinder and amongst the epithelial cells forming the outermost 

 layer of the root sheath (figs. 2, 5, 7). 



Accompanying the duct on its course to the base of the epithe- 

 lial cylinder more or less closely a large bundle of medullated 

 fibres can be seen. As they approach the base of the cylinder 

 some of the fibres, whilst still in the dermis close to the bulb, 

 terminate in enlarged extremities which are similar to those we 

 are about to describe. Others pass on to the cylinder itself and 



