| Chapter I. The Harmas | 10100 |
| Chapter II. The Anthrax | 6533 |
| Chapter III. Another Prober (Perforator) | 6986 |
| Chapter IV. Larval Dimorphism | 7074 |
| Chapter V. Heredity | 5898 |
| Chapter VI. My Schooling | 4147 |
| Chapter VII. The Pond | 6181 |
| Chapter VIII. The Caddis Worm | 7839 |
| Chapter IX. The Greenbottles | 6704 |
| Chapter X. The Gray Flesh Flies | 15448 |
| Chapter XI. The Bumblebee Fly | 5943 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 33831 |
| Chapter XIII. Mathematical Memories: My Little Table | 5150 |
| Chapter XIV. The Bluebottle: The Laying | 6953 |
| Chapter XV. The Bluebottle: The Grub | 7405 |
| Chapter XVI. A Parasite of The Maggot | 7355 |
| Chapter XVII. Recollections of Childhood | 6651 |
| Chapter XVIII. Insects and Mushrooms | 12465 |
| Chapter XIX. A Memorable Lesson | 9034 |
| Chapter XX. Industrial Chemistry | 6703 |
