| Chapter I. The Harmas | 6959 |
| Chapter II. The Anthrax | 4465 |
| Chapter III. Another Prober (Perforator) | 5042 |
| Chapter IV. Larval Dimorphism | 5162 |
| Chapter V. Heredity | 3990 |
| Chapter VI. My Schooling | 2522 |
| Chapter VII. The Pond | 4321 |
| Chapter VIII. The Caddis Worm | 5926 |
| Chapter IX. The Greenbottles | 4810 |
| Chapter X. The Gray Flesh Flies | 13041 |
| Chapter XI. The Bumblebee Fly | 4135 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 13983 |
| Chapter XIII. Mathematical Memories: My Little Table | 3371 |
| Chapter XIV. The Bluebottle: The Laying | 5281 |
| Chapter XV. The Bluebottle: The Grub | 5455 |
| Chapter XVI. A Parasite of The Maggot | 5481 |
| Chapter XVII. Recollections of Childhood | 4796 |
| Chapter XVIII. Insects and Mushrooms | 9957 |
| Chapter XIX. A Memorable Lesson | 7327 |
| Chapter XX. Industrial Chemistry | 4854 |
