| Chapter I. The Harmas | 3110 |
| Chapter II. The Anthrax | 1615 |
| Chapter III. Another Prober (Perforator) | 2605 |
| Chapter IV. Larval Dimorphism | 1898 |
| Chapter V. Heredity | 1627 |
| Chapter VI. My Schooling | 992 |
| Chapter VII. The Pond | 1816 |
| Chapter VIII. The Caddis Worm | 2868 |
| Chapter IX. The Greenbottles | 2057 |
| Chapter X. The Gray Flesh Flies | 8964 |
| Chapter XI. The Bumblebee Fly | 1849 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 4938 |
| Chapter XIII. Mathematical Memories: My Little Table | 1510 |
| Chapter XIV. The Bluebottle: The Laying | 2753 |
| Chapter XV. The Bluebottle: The Grub | 2979 |
| Chapter XVI. A Parasite of The Maggot | 2584 |
| Chapter XVII. Recollections of Childhood | 1841 |
| Chapter XVIII. Insects and Mushrooms | 5503 |
| Chapter XIX. A Memorable Lesson | 4051 |
| Chapter XX. Industrial Chemistry | 1850 |
