| | PAGE |
| I. | On the Natural History of the Man-Like Apes | 1 |
| II. | On the Relations of Man to the Lower Animals | 52 |
| III. | On Some Fossil Remains of Man | 111 |
| IV. | The Present Condition of Organic Nature | 151 |
| V. | The Past Condition of Organic Nature | 168 |
| VI. | The Method by which the Causes of the Present and Past Conditions of Organic |
| Nature are to be Discovered.—The Origination of Living Beings | 186 |
| VII. | The Perpetuation of Living Beings, Hereditary Transmission and Variation | 208 |
| VIII. | The Conditions of Existence as Affecting the Perpetuation of Living Beings | 225 |
| IX. | A Critical Examination of the Position of Mr. Darwin’s Work, “On the |
| Origin of Species,” in Relation to the Complete Theory of the Causes of the |
| Phenomena of Organic Nature | 245 |
| X. | On the Educational Value of the Natural History Sciences | 264 |
| (Lecture delivered at St. Martin’s Hall, July 22, 1854). |
| XI. | On the Persistent Types of Animal Life | 283 |
| (Lecture delivered at the Royal Institution, June 3, 1859.) |
| XII. | Time and Life | 287 |
| (Macmillan’s Magazine, December 1859.) |
| XIII. | Darwin on the Origin of Species | 299 |
| (Westminster Review, April 1860.) |
| XIV. | The Darwinian Hypothesis | 337 |
| (Times, December 26, 1859.) |
| XV. | A Lobster; or, The Study of Zoology | 352 |
| (Lecture delivered at South Kensington Museum, May 14, 1860). |
