| Chapter I. The Harmas | 7073 |
| Chapter II. The Anthrax | 4741 |
| Chapter III. Another Prober (Perforator) | 5139 |
| Chapter IV. Larval Dimorphism | 5264 |
| Chapter V. Heredity | 4071 |
| Chapter VI. My Schooling | 2592 |
| Chapter VII. The Pond | 4403 |
| Chapter VIII. The Caddis Worm | 6028 |
| Chapter IX. The Greenbottles | 4927 |
| Chapter X. The Gray Flesh Flies | 13161 |
| Chapter XI. The Bumblebee Fly | 4222 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 14223 |
| Chapter XIII. Mathematical Memories: My Little Table | 3459 |
| Chapter XIV. The Bluebottle: The Laying | 5372 |
| Chapter XV. The Bluebottle: The Grub | 5534 |
| Chapter XVI. A Parasite of The Maggot | 5575 |
| Chapter XVII. Recollections of Childhood | 4895 |
| Chapter XVIII. Insects and Mushrooms | 10099 |
| Chapter XIX. A Memorable Lesson | 7426 |
| Chapter XX. Industrial Chemistry | 4940 |
