| Chapter I. The Harmas | 2375 |
| Chapter II. The Anthrax | 1120 |
| Chapter III. Another Prober (Perforator) | 1696 |
| Chapter IV. Larval Dimorphism | 1111 |
| Chapter V. Heredity | 1228 |
| Chapter VI. My Schooling | 701 |
| Chapter VII. The Pond | 1437 |
| Chapter VIII. The Caddis Worm | 2170 |
| Chapter IX. The Greenbottles | 1554 |
| Chapter X. The Gray Flesh Flies | 7456 |
| Chapter XI. The Bumblebee Fly | 1390 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 4178 |
| Chapter XIII. Mathematical Memories: My Little Table | 1199 |
| Chapter XIV. The Bluebottle: The Laying | 2229 |
| Chapter XV. The Bluebottle: The Grub | 2439 |
| Chapter XVI. A Parasite of The Maggot | 1904 |
| Chapter XVII. Recollections of Childhood | 1376 |
| Chapter XVIII. Insects and Mushrooms | 4066 |
| Chapter XIX. A Memorable Lesson | 3007 |
| Chapter XX. Industrial Chemistry | 1434 |
