| PAGE |
| STROMNESS AND ITS ASTEROLEPIS.—THE LAKE OF STENNIS | [21] |
| THE DEVELOPMENT HYPOTHESIS, AND ITS CONSEQUENCES | [37] |
| THE RECENT HISTORY OF THE ASTEROLEPIS.—ITS FAMILY | [48] |
| CEREBRAL DEVELOPMENT OF THE EARLIER VERTEBRATA.—ITS APPARENT PRINCIPLE | [62] |
| THE ASTEROLEPIS.—ITS STRUCTURE, BULK, AND ASPECT | [94] |
| FISHES OF THE SILURIAN ROCKS, UPPER AND LOWER.—THEIR RECENT HISTORY, ORDER, AND SIZE | [130] |
| HIGH STANDING OF THE PLACOIDS.—OBJECTIONS CONSIDERED | [147] |
| THE PLACOID BRAIN.—EMBRYONIC CHARACTERISTICS NOT NECESSARILY OF A LOW ORDER | [160] |
| THE PROGRESS OF DEGRADATION.—ITS HISTORY | [181] |
| EVIDENCE OF THE SILURIAN MOLLUSCS.—OF THE FOSSIL FLORA.—ANCIENT TREE | [205] |
| SUPERPOSITION NOT PARENTAL RELATION.—THE BEGINNINGS OF LIFE | [230] |
| LAMARCKIAN HYPOTHESIS OF THE ORIGIN OF PLANTS.—ITS CONSEQUENCES | [243] |
| THE TWO FLORAS, MARINE AND TERRESTRIAL.—BEARING OF THE EXPERIENCE ARGUMENT | [262] |
| THE DEVELOPMENT HYPOTHESIS IN ITS EMBRYONIC STATE.—OLDER THAN ITS ALLEGED FOUNDATIONS | [277] |
| FINAL CAUSES—THEIR BEARING ON GEOLOGIC HISTORY—CONCLUSION | [303] |