BY J. T. WILSON AND C. J. MARTIN. 671 



modification of Ehrlich's j^rocess* has fully confirmed our con- 

 clusions. Striking views of the intermediate disc or plate between 

 the two clear vesicular cells of the body were obtained, its nervous 

 character being indicated by its colour reaction with the methyl 

 blue. It bore a distinct resemblance, though on a smaller scale, to 

 the nerve disc stained with methyl blue figured by Dogielf in the 

 Gi-andry's corpuscles, with which structures we formerly compared 

 the lenticular bodies. 



The methyl blue reaction was also exhil^ited by the other 

 nervous structures in connection with the rods, viz., the nerve- 

 fibres, the cores of the Pacinian-like corpuscles and also by the 

 fibrils in the rod itself. Thus we have the most ample histological 

 confirmation of the nervous character of these structures. We 

 therefore believe that we are entitled to state definitely that 

 these interesting filaments, in spite of their fairly definite and 

 regular arrangement, are nothing but the end branchings of axis- 

 cylinders of sensory nerve fibres, which have acquired a slightly 

 specialised character from their definite relation to certain specially 

 differentiated epidermal cells arranged so as to constitute the rod- 

 organ. 



Possibly such an examj)le of differentiated and correlated nervous 

 and epithelial structures may be regarded as standing midway 

 between the ordinar}- intra-epidermic end-branchings of cutaneous 

 nerves and such specialised epithelial and nervous arrangements 

 as are found for example in the tastebuds, where also we have 

 axis-cylinders ending freely by terminal filaments in intimate 

 relation with far more highly specialised epithelial cells. 



II. — The 8weat-ducts and their Associated Structures. 



The general characters and position of these glands were 

 described by Poulton in 1884i and again in the present year.§ 



*Zeit9ch. f. wiss. Mikr. ix. 1, 1892, p. 15. 



t Arch. f. Anat. u. Physiol. 1891, p. 182. 



X Journ. of Physiology, Vol. v. pp. 15-16. 



§ Quart. Journ. of Micros Science. June, 1894. 



