| Chapter I. The Harmas | 1034 |
| Chapter II. The Anthrax | 450 |
| Chapter III. Another Prober (Perforator) | 775 |
| Chapter IV. Larval Dimorphism | 467 |
| Chapter V. Heredity | 588 |
| Chapter VI. My Schooling | 370 |
| Chapter VII. The Pond | 748 |
| Chapter VIII. The Caddis Worm | 618 |
| Chapter IX. The Greenbottles | 712 |
| Chapter X. The Gray Flesh Flies | 1794 |
| Chapter XI. The Bumblebee Fly | 616 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 1931 |
| Chapter XIII. Mathematical Memories: My Little Table | 660 |
| Chapter XIV. The Bluebottle: The Laying | 957 |
| Chapter XV. The Bluebottle: The Grub | 1273 |
| Chapter XVI. A Parasite of The Maggot | 934 |
| Chapter XVII. Recollections of Childhood | 622 |
| Chapter XVIII. Insects and Mushrooms | 1674 |
| Chapter XIX. A Memorable Lesson | 1004 |
| Chapter XX. Industrial Chemistry | 854 |