| Chapter I. The Harmas | 6786 |
| Chapter II. The Anthrax | 4329 |
| Chapter III. Another Prober (Perforator) | 4937 |
| Chapter IV. Larval Dimorphism | 4998 |
| Chapter V. Heredity | 3866 |
| Chapter VI. My Schooling | 2422 |
| Chapter VII. The Pond | 4196 |
| Chapter VIII. The Caddis Worm | 5803 |
| Chapter IX. The Greenbottles | 4681 |
| Chapter X. The Gray Flesh Flies | 12899 |
| Chapter XI. The Bumblebee Fly | 4008 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 13716 |
| Chapter XIII. Mathematical Memories: My Little Table | 3257 |
| Chapter XIV. The Bluebottle: The Laying | 5161 |
| Chapter XV. The Bluebottle: The Grub | 5336 |
| Chapter XVI. A Parasite of The Maggot | 5366 |
| Chapter XVII. Recollections of Childhood | 4676 |
| Chapter XVIII. Insects and Mushrooms | 9811 |
| Chapter XIX. A Memorable Lesson | 7217 |
| Chapter XX. Industrial Chemistry | 4722 |
