| Chapter I. The Harmas | 5864 |
| Chapter II. The Anthrax | 3434 |
| Chapter III. Another Prober (Perforator) | 4424 |
| Chapter IV. Larval Dimorphism | 4234 |
| Chapter V. Heredity | 3214 |
| Chapter VI. My Schooling | 1984 |
| Chapter VII. The Pond | 3583 |
| Chapter VIII. The Caddis Worm | 5065 |
| Chapter IX. The Greenbottles | 3932 |
| Chapter X. The Gray Flesh Flies | 12054 |
| Chapter XI. The Bumblebee Fly | 3399 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 11254 |
| Chapter XIII. Mathematical Memories: My Little Table | 2697 |
| Chapter XIV. The Bluebottle: The Laying | 4618 |
| Chapter XV. The Bluebottle: The Grub | 4733 |
| Chapter XVI. A Parasite of The Maggot | 4712 |
| Chapter XVII. Recollections of Childhood | 4092 |
| Chapter XVIII. Insects and Mushrooms | 8782 |
| Chapter XIX. A Memorable Lesson | 6546 |
| Chapter XX. Industrial Chemistry | 4042 |
