158 Cincinnati Society of Natural History. 



Fig. 3. — Section nearer the median plane, showing the position 

 of the roots of the fifth, eighth, tenth and twelfth nerves. 



Fig. 4. — Corresponding section of anterior portion of the brain. 

 c. p., corpus posterius; p. /., peduncular tracts, where they 

 diverge; /. #., fibrse ansulatae (?). 



Figs. 5, 6. — Sections still nearer median plane, c. post., posterior 

 commissure; col., colliculi ; c. p., corpus posterius; 0. tr., 

 optic tracts; 0. , olfactory tracts. 



Figs. 7, 8. — Sections quite near the median line. c. s., superior 

 commissure; t. t/i., taenia thalami; a. c, anterior commissure; 

 c. gn., corpus geniculatum; M. b., Meynert's bundle; tr. p. c, 

 tract from region of posterior commissure; g. ip., interpedun- 

 cular ganglion; IV., r., roots of fourth nerve; just in front of 

 it the tracts to cerebellum appear. 



Fig. 9- — A section through the front part of the brain, a little 

 lateral to that of Fig. 8. /., tract from colliculi to corpus 

 posterius; HI., r., roots of third nerve; 0. n., optic nerve. 



Fig. 10. — From the motor nucleus of the filth nerve. 



Fig. 11. — A motor area of the cortex from the section of Fig. 5, 

 Plate VIII., which see. The surface is to the right, the 

 epithelium of the ventricle to the left. 



Plate X. 



Chiefly horizontal sections through the thalamus and the hemispheres. 



Fig. 1. — Section below (ventrad to) the anterior commissure. 



Fig. 2. — Section from a somewhat higher level. 



Figs. 3-6. — Sections successively ventrad to Fig. 1, Fig. 6 being 

 through the tuber cinereum and chiasm. /. a., fibrge ansu- 

 latae (?); tr. 0., optic tracts; ol. t., olfactory tracts; c. i., c. e., 

 for the most part fibres from the inferior commissure; ch., 

 chiasm. 



Fig. 7.- — Portion of the nucleus of the tenth nerve. The tract at 

 the left pisses to the root of the vagus. The two kinds of 

 cells mentioned in the text are here shown, the sensory variety 

 predominating. 



