1889. "On the Relation between the Structure, Function, Distribution, and Origin of the Cranial Nerves; together with a Theory of the Origin of the Nervous System of Vertebrata." _Journal of Physiology_, vol. x., p. 153. 1889. "On the Origin of the Central Nervous System of Vertebrates." _Brain_, vol. xii., p. 1. 1890. "On the Origin of Vertebrates from a Crustacean-like Ancestor." _Quarterly Journal of Microscopical Science_, vol. xxxi., p. 379. 1895. "The Origin of Vertebrates." _Proceedings of the Cambridge Philosophical Society_, vol. ix., p. 19. 1896. Presidential Address to Section I. at the meeting of the British Association for the Advancement of Science in Liverpool. _Report of the British Association_, 1896, p. 942. 1899. "On the Meaning of the Cranial Nerves." Presidential Address to the Neurological Society for the year 1899. _Brain_, vol. xxii., p. 329. A series of papers on "The Origin of Vertebrates, deduced from the study of Ammocoetes," in the _Journal of Anatomy and Physiology_, as follows:-- 1898. Part I. "The Origin of the Brain," vol. xxxii., p. 513. " II. "The Origin of the Vertebrate Cranio-facial Skeleton," vol. xxxii., p. 553. " III. "The Origin of the Branchial Segmentation," vol. xxxiii., p. 154. 1899. " IV. "The Thyroid, or Opercular Segment: the Meaning of the Facial Nerve," vol. xxxiii., p. 638. 1900. " V. "The Origin of the Pro-otic Segmentation: the Meaning of the Trigeminal and Eye-muscle Nerves," vol. xxxiv., p. 465. 1900. " VI. "The Old Mouth and the Olfactory Organ: the Meaning of the First Nerve," vol. xxxiv., p. 514. 1900. " VII. "The Evidence of Prosomatic Appendages in Ammocoetes, as given by the Course and Distribution of the Trigeminal Nerve," vol. xxxiv., p. 537. 1900. " VIII. "The Palæontological Evidence: Ammocoetes a Cephalaspid," vol. xxxiv., p. 562. 1901. " IX. "The Origin of the Optic Apparatus: the Meaning of the Optic Nerves," vol. xxxv., p. 224. 1902. " X. "The Origin of the Auditory Organ: the Meaning of the VIIIth Cranial Nerve," vol. xxxvi., p. 164. 1903. " XI. "The Origin of the Vertebrate Body-cavity and Excretory Organs: the Meaning of the Somites of the Trunk and of the Ductless Glands," vol. xxxvii., p. 168. 1905. " XII. "The Principles of Embryology," vol. xxxix., p. 371. 1906. " XIII. "The Origin of the Notochord and Alimentary Canal," vol. xl., p. 305. {8}CHAPTER I _THE EVIDENCE OF THE CENTRAL NERVOUS SYSTEM_