| Chapter I. The Harmas | 7018 |
| Chapter II. The Anthrax | 4692 |
| Chapter III. Another Prober (Perforator) | 5106 |
| Chapter IV. Larval Dimorphism | 5226 |
| Chapter V. Heredity | 4034 |
| Chapter VI. My Schooling | 2561 |
| Chapter VII. The Pond | 4370 |
| Chapter VIII. The Caddis Worm | 5985 |
| Chapter IX. The Greenbottles | 4878 |
| Chapter X. The Gray Flesh Flies | 13110 |
| Chapter XI. The Bumblebee Fly | 4185 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 14127 |
| Chapter XIII. Mathematical Memories: My Little Table | 3413 |
| Chapter XIV. The Bluebottle: The Laying | 5338 |
| Chapter XV. The Bluebottle: The Grub | 5498 |
| Chapter XVI. A Parasite of The Maggot | 5536 |
| Chapter XVII. Recollections of Childhood | 4857 |
| Chapter XVIII. Insects and Mushrooms | 10035 |
| Chapter XIX. A Memorable Lesson | 7391 |
| Chapter XX. Industrial Chemistry | 4909 |
