| Chapter I. The Harmas | 9896 |
| Chapter II. The Anthrax | 6392 |
| Chapter III. Another Prober (Perforator) | 6860 |
| Chapter IV. Larval Dimorphism | 6949 |
| Chapter V. Heredity | 5779 |
| Chapter VI. My Schooling | 4044 |
| Chapter VII. The Pond | 6060 |
| Chapter VIII. The Caddis Worm | 7711 |
| Chapter IX. The Greenbottles | 6583 |
| Chapter X. The Gray Flesh Flies | 15292 |
| Chapter XI. The Bumblebee Fly | 5808 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 33407 |
| Chapter XIII. Mathematical Memories: My Little Table | 5028 |
| Chapter XIV. The Bluebottle: The Laying | 6840 |
| Chapter XV. The Bluebottle: The Grub | 7285 |
| Chapter XVI. A Parasite of The Maggot | 7225 |
| Chapter XVII. Recollections of Childhood | 6530 |
| Chapter XVIII. Insects and Mushrooms | 12304 |
| Chapter XIX. A Memorable Lesson | 8925 |
| Chapter XX. Industrial Chemistry | 6579 |
