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Brain and Spinal Cord: Fig. 158. Medullary Folds uniting to form the Neural Tube in a Human Embryo of about 14 days. (After Graf Spee.) | Fig. 159. Diagram of the Four Primary Divisions of the Neural Tube. | Fig. 160. Diagrammatic Section showing the three Zones of the Spinal Neural Tube at the Gth week. | Fig. 161. Diagrammatic Section o£ the Spinal Cord to show the Parts formed in the three Zones of the Embryonic Spinal Cord. | Fig. 162. Section across the Hind Brain of a Human Embryo in the 5th week. | Fig. 163. Lateral view of the Cephalic Part of the Neural Tube in a 5th week human embryo. (After His.) | Fig. 164. Diagram of the Attachments of the Inferior Medullary Velum in a 5th month foetus. (After Kollmann.) | Fig. 165. Median Section of the Cerebellum and 4th Ventricle of a Frog. | Fig. 166. Diagrammatic Section of the Cerebellum of a 3rd month Human Foetus showing the folding of the Cerebellar Plate. | Fig. 167. A schematic figure to show the parts derived from the walls of the fore-brain. (After His.) | Fig. 168. Transverse Section of the brain of a Human Foetus at the commencement of the 3rd month to show the Cerebral Vesicles overlapping the Thalamencephalon. | Fig. 169. Diagrammatic Section across the 3rd Ventricle of the Adult to show the Structures formed in its Walls. | Fig. 170. A dorsal view of the Fore and Mid-brain at the 5th week of development to show the formation of the Velum Interpositum. | Fig. 171. Mesial Aspect of the human Foetal Brain during the 4th month. (After Minot.) | Fig. 172. Diagram to show the structures formed in the Lamina Terminalis and Primitive Callosal Gyrus. (After Elliot Smith.) | Fig. 173. Showing the Development of the Corpus Striatum in the floor and outer wall of the Cerebral Vesicle. | Fig. 174. Lateral Aspect of the Cerebral Hemisphere during the 2nd month. | Fig. 175. The same Aspect during the 5t'h month. | Fig. 176. The same Aspect during the 7th month. | Fiq. 177. Diagram of the Opercula and Fissure of Sylvius. In A the orbital operculum is undivided ; in B it is subdivided. (After Cunningham.) | Fig. 178. The Island of Reil and Fissures on the lateral Aspect of the Brain of a dog-like Ape. | Fig. 179A. The more common Condition of the Island of Reil in Anthropoids. Fig. 179B. The complete isolation of the Island of Reil, the condition seen constantly in the Human Brain and occasionally in the Anthropoid. | Fig. 180. A Diagram to show the Relationship of the Cranial Nerves to the Primitive Segments of the Head.Figures