144 Journal of Comparative Neurology. 



DESCRIPTION OF PLATES. 

 PLATE VIII. 



Fig. I. Small sympathetic ganglion in the wall of theMrachea, stained in 

 methylen-blue. (Arnstein (36) Fig. 8 ) 



A, sympathetic cell; a, neuraxis; b, dendrites; c, involuntary muscle tis- 

 sue. Pr. G. F., preganglionic fiber; Pr. B., pericellular baskets. 



Fig. 2. Ending of non-medullated nerve fiber, neuraxis of sympathetic 

 neuron, in involuntary muscle cell of the intestine of a cat. 1-I2 in. oil im- 

 mersion obj., Leitz, and No. i eye piece. From section of 5// thickness, double 

 stained in methylen-blue and alum carmine; a, neuraxis of sympathetic neuron, 

 ending on cell b, at a^\ c, nucleus of cell. 



Fig. J. Showing vaso-motor nerves of a small vessel in pharynx of frog, 

 stained in methvlen-blue. Leitz I-12 in. oil im., No. i eye-piece. A few of 

 the non-striated muscle cells of the vessel wall were stained, as shown in the 

 figure. 



Fig. 4. Ending of the neuraxes of sympathetic neurons on the heart- 

 muscle cells of a cat's auricle"; from sections double stained in methylen-blue 

 and alum carmine. The figure shows endings of varying complexity : a, a very 

 simple ending; (5 and c, more complex endings. Leitz 1-12 oil im.. No. i eye 

 piece. 



Fi^. 5. Ending of sympathetic nerves on gland cells. Copied from Arns- 

 tein (61): — 



a, isolated gland cell from the parotid gland of a rabbit; 



b, isolated gland cells from the mammary gland of a pregnant cat; 



c, isolated gland cell from a sweat gland ; 



d, a portion of a teased sweat gland, showing a number of cells with nerve 

 endings. 



Fig. 6. Scheme of reflex in the sympathetic ganglia in the intestinal 

 plexus. Copied from Dogiel (71). 



a, motor sympathetic neurons; b, a sensory sympathetic neuron; /r, den- 

 drites or protoplasmic brancb.es ; ax, axis-cylinder branches or neuraxes. 



/, tunica propria ; 2, muscularis mucosa ; j, submucosa ; 4, muscular coat 

 with four sympathetic ganglia. 



Fig. 7. From section of sympathetic ganglion (semilunar) of a cat, stained 

 in methylen-blue. Leitz 1-12 in. im. No. i eye piece, reduced to two-thirds. 



a, cell body of sympathetic neuron; c, dendrite; d, neuraxis; b, neuraxis 

 of another sympathetic neuron ending on dendrite at b'. 



Fig. S. Sympathetic cells and pericellular baskets from sympathetic gan- 

 glia of vertebrates : — 



A, mammal, (dog); B, bird, (chicken); Cand C\ reptilia, (Chelhydra ser- 

 pentina); D, frog, (Rana Catesbiana); E, fish, {Micropterus dolomieu Raf). 



