HamiLton, Diviston of Cells in Nervous System. 319 
DESCRIPTION OF FIGURES. 
All the sections are from the white rat. 
Fig. z. Cross-section of lumbar cord of foetus (Body length 17 mm.), 
showing distribution of mitoses. Mitotic figures in black. 
Fig. 2. Cross-section of lumbar cord of new-born rat, showing distribu- 
tion of mitoses. 
Fig. 3. Cross-section of cerebral hemisphere of foetus (Body lene 17 
mm.) showing distribution of mitoses. 
fig. 4. Cross-section of cerebral hemisphere of new-born rat, showing 
distribution of mitoses. 
fig. 5. Ependyma of foetal brain. 
(a) Ventricular surfaces with germinal cells. 
(b) Germinal cell at a distance from ventricle. 
fig. 6. Ependyma of iumbar cord of new-born rat. 
(a) Typical germinal cells. 
(b) Long pointed dividing cell in ventral plate. 
fig. 7. Ependyma of lumbar cord of foetus. 
(a) Long dividing cell with process, in dorsal plate. 
Fig. 8. Lumbar cord of new-born rat, anterior gray column. 
(a) (b) dividing cells of 1st class, delicate chromosomes, no appar- 
ent cell body. 
Fig. 9. Cervical cord of new-born rat, lateral fiber tracts. 
(a) small dividing cell of 1st class. 
fig. ro. Brain of new-born rat, fiber tracts. Ventricular surface towards 
bottom of the figure. 
(a) small dividing cell of Ist class. 
(b) neuroblasts turning. 
(c) neuroblasts which have finished their half revolution. 
Fig. 71. Cervical cord of new-born rat, anterior gray column. 
(a) small, 
(b) large dividing cell of 2nd class, with thick chromosomes and 
granular cytoplasm. 
fig. 72. Cervical cord of new born rat, anterior gray column. 
(a) large pointed dividing cell of the 2nd class. 
(b) multipolar nerve cell. 
Fig. 13. Lumbar cord of four days rat, anterior gray column. 
(a) Spindle shaped dividing cell of 2nd class. 
fig. 1g. Lumbar cord of new-born rat, posterior gray column. 
(a) Large dividing cell of 2nd class in anaphase. 
fig. 15. Brain of foetus, cortical cell layer. 
(a) pial surface. 
(b) dividing cell of 2nd class. 
fig. 16. . Brain of new-born rat, cortical cell layer. 
(a) large dividing cell of 2nd class. 
(b) pyramidal cell. 
