126 Journal of Comparative Neurology and Psychology. 



Fic; 



Fig. 8 



^tg- 7- — Diagrammatic reconstruction of the sympathetic nervous system of 

 a 9 mm. toad, dorsal view. The kidney and the sympathetic with its related 

 structures are represented as having been shifted from a position inferiorly along 

 side the aorta (see Fig. i) to a position on a level with the spinal cord, but re- 

 moved laterally a distance equal to that between the sympathetic and the spinal 

 cord before the change of position. The more closely dotted portion represents 

 sympathetic tissue; posterior to the second spinal nei>ve, the 'a'idtli of this closely 

 dotted portion represents the height of the sympathetic ridge. The lightly dot- 

 ted area represents the structures with which the sympathetic is connected dur- 

 ing its development. X marks the anterior end of the adult kidney. The con- 

 nection between the sympathetic and the spinal nerves is not shown. * marks 

 the anterior end of the median dorsal aorta. H. A'., head kidney. V. IV., fourth 

 ventricle. A'., vagus ganglion. /., 2., etc., ganglia of first, second, etc. spinal 

 nerves. For other abbreviations, see Fig's. i-6. X 21. 



Fig 8. — Diagrammatic reconstruction of the sympathetic nervous system 

 of a 12.5 mm. toad. The representation of the rami communicantes here and 

 in succeeding figures is exceedingly diagrammatic. For abbreviations and other 

 explanations, see Fig. 7. x 28. 



