| Chapter I. The Harmas | 6970 |
| Chapter II. The Anthrax | 4651 |
| Chapter III. Another Prober (Perforator) | 5070 |
| Chapter IV. Larval Dimorphism | 5167 |
| Chapter V. Heredity | 3999 |
| Chapter VI. My Schooling | 2534 |
| Chapter VII. The Pond | 4332 |
| Chapter VIII. The Caddis Worm | 5946 |
| Chapter IX. The Greenbottles | 4839 |
| Chapter X. The Gray Flesh Flies | 13064 |
| Chapter XI. The Bumblebee Fly | 4143 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 14001 |
| Chapter XIII. Mathematical Memories: My Little Table | 3382 |
| Chapter XIV. The Bluebottle: The Laying | 5298 |
| Chapter XV. The Bluebottle: The Grub | 5468 |
| Chapter XVI. A Parasite of The Maggot | 5495 |
| Chapter XVII. Recollections of Childhood | 4817 |
| Chapter XVIII. Insects and Mushrooms | 9977 |
| Chapter XIX. A Memorable Lesson | 7348 |
| Chapter XX. Industrial Chemistry | 4861 |
