| Chapter I. The Harmas | 10546 |
| Chapter II. The Anthrax | 6878 |
| Chapter III. Another Prober (Perforator) | 7283 |
| Chapter IV. Larval Dimorphism | 7312 |
| Chapter V. Heredity | 6140 |
| Chapter VI. My Schooling | 4294 |
| Chapter VII. The Pond | 6568 |
| Chapter VIII. The Caddis Worm | 8094 |
| Chapter IX. The Greenbottles | 7062 |
| Chapter X. The Gray Flesh Flies | 15846 |
| Chapter XI. The Bumblebee Fly | 6171 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 34824 |
| Chapter XIII. Mathematical Memories: My Little Table | 5375 |
| Chapter XIV. The Bluebottle: The Laying | 7165 |
| Chapter XV. The Bluebottle: The Grub | 7688 |
| Chapter XVI. A Parasite of The Maggot | 7601 |
| Chapter XVII. Recollections of Childhood | 6912 |
| Chapter XVIII. Insects and Mushrooms | 12965 |
| Chapter XIX. A Memorable Lesson | 9254 |
| Chapter XX. Industrial Chemistry | 6934 |
