| Chapter I. The Harmas | 10194 |
| Chapter II. The Anthrax | 6616 |
| Chapter III. Another Prober (Perforator) | 7052 |
| Chapter IV. Larval Dimorphism | 7143 |
| Chapter V. Heredity | 5952 |
| Chapter VI. My Schooling | 4182 |
| Chapter VII. The Pond | 6255 |
| Chapter VIII. The Caddis Worm | 7905 |
| Chapter IX. The Greenbottles | 6767 |
| Chapter X. The Gray Flesh Flies | 15561 |
| Chapter XI. The Bumblebee Fly | 6001 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 34115 |
| Chapter XIII. Mathematical Memories: My Little Table | 5211 |
| Chapter XIV. The Bluebottle: The Laying | 6998 |
| Chapter XV. The Bluebottle: The Grub | 7470 |
| Chapter XVI. A Parasite of The Maggot | 7410 |
| Chapter XVII. Recollections of Childhood | 6703 |
| Chapter XVIII. Insects and Mushrooms | 12551 |
| Chapter XIX. A Memorable Lesson | 9081 |
| Chapter XX. Industrial Chemistry | 6762 |
