192 Prof. A. B. Macallum and Miss M. L. Menten. [July 24, 



Plate 3. 



Fig. 9. — From ganglionic cord of lobster, thoracic region ; a showing the diffuse chloride 



N 



reaction in the axon, b the striate arrangement. AgN0 3 — + 1*5 per cent. 

 HN0 3 for 24 hours, x 1360. 



Fig. 10. — a — d, from the sciatic of frog, illustrating the distribution of chlorides as 



revealed by the mercurous nitrate method. In d the clefts of Lanterman 



g 



are seen as double funnels extending to the axon. Mercurous nitrate — 

 (S = saturation), 30 minutes, ammonium sulphide glycerine, x 590. 



Fig. 11. — From the sciatic of frog, illustrating the diffuse and the laminated distribu- 

 tion of the chlorides, as revealed by the mercurous nitrate method. At I in 

 b is seen a cleft of Lanterman, somewhat obscured by the precipitate, where 



apparently the reagent entered to produce the Frommann striation 



g 



occurring on either side of it. Hg„(N0 3 ) 2 30 minutes, ammonium 

 sulphide, glycerine, x 590. 



Fig. 12. — From the sciatic of frog, illustrating the distribution of the chlorides, as 



g 



revealed by different strengths of the reagent, a, Hg 2 (N0 3 ) 2 4 hours ; 

 g 



b, Hg„(N0 3 ) 2 4 hours, ammonium sulphide, glycerine. In b the chlorides 

 are chiefly found on the surface of the axon. X 590. 



Figs. 13 and 14. — From the sciatic of frog, a, cleft of Lanterman, through which the 



reagent has penetrated to the axon and produced in the latter the 



Frommann striation. n, node of Ranvier, with the adjacent portion of the 

 g 



axon stiiated. Hg 2 (N0 3 ) 2 -j-, 30 minutes, ammonium sulphide, glycerine, 

 x 590. 



Fig. 15. — Showing diffuse distribution of the chlorides in the axons of the sciatic of 



g 



frog, n, node of Eanvier. Hg 2 (N0 3 ) 2 -j, 4 hours, ammonium sulphide, 

 glycerine, x 590. 



Fig. 16. — From the spinal cord of frog, illustrating a typical Frommann striation, as 



g 



revealed by the mercurous nitrate method. Hg 2 (N0 3 ) 2 — , 30 minutes, 

 ammonium sulphide, glycerine, x 590. 



