| Chapter I. The Harmas | 1044 |
| Chapter II. The Anthrax | 456 |
| Chapter III. Another Prober (Perforator) | 778 |
| Chapter IV. Larval Dimorphism | 470 |
| Chapter V. Heredity | 592 |
| Chapter VI. My Schooling | 372 |
| Chapter VII. The Pond | 759 |
| Chapter VIII. The Caddis Worm | 620 |
| Chapter IX. The Greenbottles | 715 |
| Chapter X. The Gray Flesh Flies | 1803 |
| Chapter XI. The Bumblebee Fly | 622 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 1949 |
| Chapter XIII. Mathematical Memories: My Little Table | 661 |
| Chapter XIV. The Bluebottle: The Laying | 962 |
| Chapter XV. The Bluebottle: The Grub | 1279 |
| Chapter XVI. A Parasite of The Maggot | 937 |
| Chapter XVII. Recollections of Childhood | 631 |
| Chapter XVIII. Insects and Mushrooms | 1692 |
| Chapter XIX. A Memorable Lesson | 1009 |
| Chapter XX. Industrial Chemistry | 859 |