| Chapter I. The Harmas | 5967 |
| Chapter II. The Anthrax | 3525 |
| Chapter III. Another Prober (Perforator) | 4483 |
| Chapter IV. Larval Dimorphism | 4330 |
| Chapter V. Heredity | 3294 |
| Chapter VI. My Schooling | 2008 |
| Chapter VII. The Pond | 3650 |
| Chapter VIII. The Caddis Worm | 5139 |
| Chapter IX. The Greenbottles | 3994 |
| Chapter X. The Gray Flesh Flies | 12165 |
| Chapter XI. The Bumblebee Fly | 3483 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 11578 |
| Chapter XIII. Mathematical Memories: My Little Table | 2775 |
| Chapter XIV. The Bluebottle: The Laying | 4691 |
| Chapter XV. The Bluebottle: The Grub | 4808 |
| Chapter XVI. A Parasite of The Maggot | 4795 |
| Chapter XVII. Recollections of Childhood | 4159 |
| Chapter XVIII. Insects and Mushrooms | 8914 |
| Chapter XIX. A Memorable Lesson | 6614 |
| Chapter XX. Industrial Chemistry | 4120 |
