| 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 |