86 HUBER. 



EXPLANATION OF PLATE III. 



All figures, with the exception of Nos. i, 19, and 26, were sketched with the 

 aid of camera lucida under a ^^i"^^ °il immersion and No. i eyepiece, the image 

 being reflected to the table, this giving a magnification of 890 diameters. Figs, i, 

 19, and 26 were sketched under a No. 7 objective and No. i eyepiece, with about 

 400 diameters amplification. 



Figs. 1-7. Sympathetic Ganglia of Fishes. 



Fig. I. Sympathetic neurons from sections of sympathetic ganglia, stained in 

 methylene blue, of small-mouth black bass {Micropterus dolomieu Raf.) ; a, b, and 

 c, unipolar cells ; d and e, multipolar cells. 



Figs. 2, 3. Pericellular plexuses found in sections of sympathetic ganglia of 

 black bass. Methylene blue stain, a, neuraxis, ending in pericellular plexus. In 

 Fig. 3 the enclosed ganglion cell is faintly indicated in black. 



Fig. 4. From teased preparation of sympathetic ganglion of black bass, 

 stained in methylene blue, fixed in ammonium molybdate and hardened in alcohol. 

 e, sympathetic cell ; n, nucleus ; and c, its capsule ; a, medullated fiber terminating 

 within the capsule in pericellular plexus. 



Fig. 5. The same cell, double-stained in alum carmine. Some of the end 

 branches of pericellular plexus terminate between the intra-capsular nuclei. 



Fig. 6. Completely isolated cell, obtained by teasing a sympathetic ganglion 

 of black bass, stained in methylene blue and alum carmine, a, cell body of a 

 sympathetic neuron ; b, medullated fiber ending within capsule c. 



Fig. 7. From the same ganglion from which Fig. 6 was taken. A, large 

 medullated fiber giving off two collateral branches, a! and a", ending within the 

 capsules of cells A and B, respectively. 



Figs. 8- it. Sympathetic Ganglia of Amphibia. 



Fig. 8. Small portion of a section of sympathetic ganglion of Rana Catesbiana, 

 stained in methylene blue ; only spiral fibers and pericellular plexuses stained. 

 Shows the connection of spiral fiber, a, with pericellular plexus, the structure of 

 which is well shown in this figure. In d we may see one of the large nodular 

 swellings now and then seen ; ^, free ending of fibril of the pericellular plexus. 



Figs. 9, 10. Two ganglion cells from section of sympathetic ganglion of Rana 

 C, stained in methylene blue and alum carmine. «, neuraxis of unipolar cell ; 

 b, sheath nuclei of the neuraxis ; c, capsule ; d, nodular swellings in pericellular 

 plexus ; e, free endings of fibrils of plexus ; s.f, spiral fibers. 



Fig. II. Sympathetic neurons of Auerbach's plexus of large intestine of 

 Rana C, stained in methylene blue and fixed in ammonium picrate. a, neuraxis ; 

 ^, dendrites. 



