Gabfenteb. — OcuiomotoT Nerve in Chick. 



PLATE 3. 



Fig. 8. Parasagittal section through ventral wall of mid-brain of an embryo in 

 Stage I {T2j4 hrs. incubation), viewed from the left side. Early neuro- 

 blasts of oculomotor nidulus. Fixed and stained in vom Eath's fluid. 

 X 1300. 

 Fie. 9. Section transverse to longitudinal axis of mid-brain of an embryo in 

 Stage II (70 hrs. incubation), sliowing root of oculomotor nerve. 

 Fixed in Zenker's fluid, and stained with Brazilin. X 800. 

 Fig. 10. From an embryo in Stage V (119>^ lirs. incubation), a, $, y. Ganglion 

 cells in ophthalmic branch of trigeminal nerve ; a, near Gasserian 

 ganglion ; $, opposite ciliary ganglion in position marlsed i8 in Figure 

 25; 7, more distal, in position marlced y in Figure 25. S, Ganglion 

 cells in ciliary ganglion. Fixed in Zenker's fluid and stained with iron 

 hematoxylin. X 1400. 



