| Chapter I. The Harmas | 9281 |
| Chapter II. The Anthrax | 6021 |
| Chapter III. Another Prober (Perforator) | 6549 |
| Chapter IV. Larval Dimorphism | 6659 |
| Chapter V. Heredity | 5494 |
| Chapter VI. My Schooling | 3789 |
| Chapter VII. The Pond | 5783 |
| Chapter VIII. The Caddis Worm | 7407 |
| Chapter IX. The Greenbottles | 6306 |
| Chapter X. The Gray Flesh Flies | 14931 |
| Chapter XI. The Bumblebee Fly | 5525 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 31251 |
| Chapter XIII. Mathematical Memories: My Little Table | 4768 |
| Chapter XIV. The Bluebottle: The Laying | 6594 |
| Chapter XV. The Bluebottle: The Grub | 7019 |
| Chapter XVI. A Parasite of The Maggot | 6922 |
| Chapter XVII. Recollections of Childhood | 6253 |
| Chapter XVIII. Insects and Mushrooms | 11864 |
| Chapter XIX. A Memorable Lesson | 8679 |
| Chapter XX. Industrial Chemistry | 6311 |
