| Chapter I. The Harmas | 7950 |
| Chapter II. The Anthrax | 5108 |
| Chapter III. Another Prober (Perforator) | 5633 |
| Chapter IV. Larval Dimorphism | 5838 |
| Chapter V. Heredity | 4627 |
| Chapter VI. My Schooling | 3081 |
| Chapter VII. The Pond | 4946 |
| Chapter VIII. The Caddis Worm | 6559 |
| Chapter IX. The Greenbottles | 5431 |
| Chapter X. The Gray Flesh Flies | 13740 |
| Chapter XI. The Bumblebee Fly | 4731 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 16850 |
| Chapter XIII. Mathematical Memories: My Little Table | 3966 |
| Chapter XIV. The Bluebottle: The Laying | 5851 |
| Chapter XV. The Bluebottle: The Grub | 6107 |
| Chapter XVI. A Parasite of The Maggot | 6106 |
| Chapter XVII. Recollections of Childhood | 5414 |
| Chapter XVIII. Insects and Mushrooms | 10675 |
| Chapter XIX. A Memorable Lesson | 7926 |
| Chapter XX. Industrial Chemistry | 5474 |
