| Chapter I. The Harmas | 10096 |
| Chapter II. The Anthrax | 6531 |
| Chapter III. Another Prober (Perforator) | 6981 |
| Chapter IV. Larval Dimorphism | 7069 |
| Chapter V. Heredity | 5896 |
| Chapter VI. My Schooling | 4146 |
| Chapter VII. The Pond | 6174 |
| Chapter VIII. The Caddis Worm | 7837 |
| Chapter IX. The Greenbottles | 6702 |
| Chapter X. The Gray Flesh Flies | 15439 |
| Chapter XI. The Bumblebee Fly | 5941 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 33818 |
| Chapter XIII. Mathematical Memories: My Little Table | 5148 |
| Chapter XIV. The Bluebottle: The Laying | 6950 |
| Chapter XV. The Bluebottle: The Grub | 7401 |
| Chapter XVI. A Parasite of The Maggot | 7353 |
| Chapter XVII. Recollections of Childhood | 6649 |
| Chapter XVIII. Insects and Mushrooms | 12462 |
| Chapter XIX. A Memorable Lesson | 9031 |
| Chapter XX. Industrial Chemistry | 6698 |
