940 



DECUSSATION OF PYRAMIDS. [BOOK in. 



a.p.C 



XII 



Py.dec. 



-fret. 



ep.n. 



-f.a.e 

 Supra.. Py.dec. 



bl.e. 



x n.a. 



Co.*. 



FIG. 109. TBANSVEBSE DOBSOVENTEAL SECTIONS or THE BULB (MAN) AT 

 DIFFEEENT LEVELS. (Sherrington). 



