| Chapter I. The Harmas | 6460 |
| Chapter II. The Anthrax | 4059 |
| Chapter III. Another Prober (Perforator) | 4769 |
| Chapter IV. Larval Dimorphism | 4742 |
| Chapter V. Heredity | 3674 |
| Chapter VI. My Schooling | 2276 |
| Chapter VII. The Pond | 4003 |
| Chapter VIII. The Caddis Worm | 5570 |
| Chapter IX. The Greenbottles | 4447 |
| Chapter X. The Gray Flesh Flies | 12677 |
| Chapter XI. The Bumblebee Fly | 3821 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 12986 |
| Chapter XIII. Mathematical Memories: My Little Table | 3079 |
| Chapter XIV. The Bluebottle: The Laying | 4970 |
| Chapter XV. The Bluebottle: The Grub | 5135 |
| Chapter XVI. A Parasite of The Maggot | 5176 |
| Chapter XVII. Recollections of Childhood | 4469 |
| Chapter XVIII. Insects and Mushrooms | 9509 |
| Chapter XIX. A Memorable Lesson | 7023 |
| Chapter XX. Industrial Chemistry | 4512 |
