| Chapter I. The Harmas | 8276 |
| Chapter II. The Anthrax | 5332 |
| Chapter III. Another Prober (Perforator) | 5863 |
| Chapter IV. Larval Dimorphism | 6055 |
| Chapter V. Heredity | 4862 |
| Chapter VI. My Schooling | 3261 |
| Chapter VII. The Pond | 5168 |
| Chapter VIII. The Caddis Worm | 6761 |
| Chapter IX. The Greenbottles | 5646 |
| Chapter X. The Gray Flesh Flies | 14092 |
| Chapter XI. The Bumblebee Fly | 4937 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 20330 |
| Chapter XIII. Mathematical Memories: My Little Table | 4176 |
| Chapter XIV. The Bluebottle: The Laying | 6027 |
| Chapter XV. The Bluebottle: The Grub | 6372 |
| Chapter XVI. A Parasite of The Maggot | 6332 |
| Chapter XVII. Recollections of Childhood | 5645 |
| Chapter XVIII. Insects and Mushrooms | 10994 |
| Chapter XIX. A Memorable Lesson | 8131 |
| Chapter XX. Industrial Chemistry | 5695 |
