| Chapter I. The Harmas | 10161 |
| Chapter II. The Anthrax | 6585 |
| Chapter III. Another Prober (Perforator) | 7026 |
| Chapter IV. Larval Dimorphism | 7117 |
| Chapter V. Heredity | 5928 |
| Chapter VI. My Schooling | 4165 |
| Chapter VII. The Pond | 6226 |
| Chapter VIII. The Caddis Worm | 7879 |
| Chapter IX. The Greenbottles | 6736 |
| Chapter X. The Gray Flesh Flies | 15517 |
| Chapter XI. The Bumblebee Fly | 5979 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 34008 |
| Chapter XIII. Mathematical Memories: My Little Table | 5188 |
| Chapter XIV. The Bluebottle: The Laying | 6978 |
| Chapter XV. The Bluebottle: The Grub | 7441 |
| Chapter XVI. A Parasite of The Maggot | 7385 |
| Chapter XVII. Recollections of Childhood | 6682 |
| Chapter XVIII. Insects and Mushrooms | 12514 |
| Chapter XIX. A Memorable Lesson | 9062 |
| Chapter XX. Industrial Chemistry | 6742 |
