| Chapter I. The Harmas | 3103 |
| Chapter II. The Anthrax | 1613 |
| Chapter III. Another Prober (Perforator) | 2600 |
| Chapter IV. Larval Dimorphism | 1893 |
| Chapter V. Heredity | 1624 |
| Chapter VII. The Pond | 1809 |
| Chapter VIII. The Caddis Worm | 2862 |
| Chapter IX. The Greenbottles | 2052 |
| Chapter X. The Gray Flesh Flies | 8953 |
| Chapter XI. The Bumblebee Fly | 1846 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 4933 |
| Chapter XIII. Mathematical Memories: My Little Table | 1505 |
| Chapter XIV. The Bluebottle: The Laying | 2747 |
| Chapter XV. The Bluebottle: The Grub | 2976 |
| Chapter XVI. A Parasite of The Maggot | 2580 |
| Chapter XVII. Recollections of Childhood | 1836 |
| Chapter XVIII. Insects and Mushrooms | 5495 |
| Chapter XX. Industrial Chemistry | 1847 |
