N o. I . ] ^ VMPA THE TIC GA NGLIA OF VER TEBRA TES. 4 7 



picrate and glycerine. By injecting only a small quantity of 

 the methylene blue stain, as above stated, now and then only 

 a few nerve fibers were stained in some of the ganglia of the 

 chain, the ganglia clearing in the glycerine to such an extent 

 that such fibers could be followed for long distances, even under 

 the oil immersion. In such preparations it was often possible 

 to trace a medullated fiber from a white ramus into a ganglion, 

 or from the interganglionic nerve trunk into the respective 

 sympathetic ganglion, and through several branchings to its 

 ending in a spiral and pericellular network. 



Some of my best examples are reproduced in Fig. I. I 

 may say that the fibers here sketched were drawn under a 

 ^2 in. oil immersion lens, with the camera lucida, and drawings 

 reduced 5 or 2| times, as stated in the description of the 

 figure. In the above figure, x by the side of a fiber indicates 

 a node of Ranvier, and j the change of a medullated to a non- 

 medullated fiber. In fiber A is shown the neuraxis of a large 

 medullated fiber, which entered the first sympathetic ganglion 

 through a nerve uniting the ganglion with the vagus ganglion ; 

 the fiber was traced for a distance much greater than shown in 

 the figure. Soon after entering the ganglion this nerve divided 

 into two branches, both of which were medullated. The right 

 branch was traced through three nodes of Ranvier, when it 

 became non-medullated. After a short distance this non- 

 medullated fiber divided into two branches, one of which was 

 traced into a spiral fiber and pericellular basket ; the other 

 terminated abruptly. The left branch of fiber A was traced 

 through four nodes of Ranvier, where a small collateral branch 

 was given off {b in the figure), which could be followed for only 

 a short distance. At the succeeding node the fiber became 

 non-medullated and divided into three branches, c, d, and e. 

 Branch c was traced to a pericellular network ; branch d, re- 

 flected upon itself at d', divided into two branches, one of 

 which ended in a spiral and network ; branch e was followed a 

 long distance, when it also terminated in a spiral and pericel' 

 lular network. Fibers B, C, and D are sketched from the eighth 

 sympathetic ganglion. In each case the fiber sketched shows 

 only a short segment of the neuraxis before branching; these 



