| Chapter I. The Harmas | 6360 |
| Chapter II. The Anthrax | 3953 |
| Chapter III. Another Prober (Perforator) | 4708 |
| Chapter IV. Larval Dimorphism | 4652 |
| Chapter V. Heredity | 3603 |
| Chapter VI. My Schooling | 2234 |
| Chapter VII. The Pond | 3925 |
| Chapter VIII. The Caddis Worm | 5483 |
| Chapter IX. The Greenbottles | 4367 |
| Chapter X. The Gray Flesh Flies | 12578 |
| Chapter XI. The Bumblebee Fly | 3753 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 12662 |
| Chapter XIII. Mathematical Memories: My Little Table | 3011 |
| Chapter XIV. The Bluebottle: The Laying | 4904 |
| Chapter XV. The Bluebottle: The Grub | 5063 |
| Chapter XVI. A Parasite of The Maggot | 5109 |
| Chapter XVII. Recollections of Childhood | 4398 |
| Chapter XVIII. Insects and Mushrooms | 9386 |
| Chapter XIX. A Memorable Lesson | 6948 |
| Chapter XX. Industrial Chemistry | 4435 |
