| Chapter I. The Harmas | 8740 |
| Chapter II. The Anthrax | 5655 |
| Chapter III. Another Prober (Perforator) | 6183 |
| Chapter IV. Larval Dimorphism | 6352 |
| Chapter V. Heredity | 5159 |
| Chapter VI. My Schooling | 3520 |
| Chapter VII. The Pond | 5476 |
| Chapter VIII. The Caddis Worm | 7074 |
| Chapter IX. The Greenbottles | 5987 |
| Chapter X. The Gray Flesh Flies | 14492 |
| Chapter XI. The Bumblebee Fly | 5237 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 27071 |
| Chapter XIII. Mathematical Memories: My Little Table | 4470 |
| Chapter XIV. The Bluebottle: The Laying | 6295 |
| Chapter XV. The Bluebottle: The Grub | 6692 |
| Chapter XVI. A Parasite of The Maggot | 6625 |
| Chapter XVII. Recollections of Childhood | 5944 |
| Chapter XVIII. Insects and Mushrooms | 11418 |
| Chapter XIX. A Memorable Lesson | 8407 |
| Chapter XX. Industrial Chemistry | 6005 |
