| Chapter I. The Harmas | 2379 |
| Chapter II. The Anthrax | 1124 |
| Chapter III. Another Prober (Perforator) | 1697 |
| Chapter IV. Larval Dimorphism | 1112 |
| Chapter V. Heredity | 1229 |
| Chapter VII. The Pond | 1439 |
| Chapter VIII. The Caddis Worm | 2175 |
| Chapter IX. The Greenbottles | 1555 |
| Chapter X. The Gray Flesh Flies | 7477 |
| Chapter XI. The Bumblebee Fly | 1393 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 4185 |
| Chapter XIII. Mathematical Memories: My Little Table | 1204 |
| Chapter XIV. The Bluebottle: The Laying | 2229 |
| Chapter XV. The Bluebottle: The Grub | 2440 |
| Chapter XVI. A Parasite of The Maggot | 1905 |
| Chapter XVII. Recollections of Childhood | 1376 |
| Chapter XVIII. Insects and Mushrooms | 4091 |
| Chapter XX. Industrial Chemistry | 1434 |
