| Chapter I. The Harmas | 1052 |
| Chapter IV. The Mother Decides the sex of the egg | 751 |
| Chapter XII. The Halicti: a Parasite | 720 |
| Chapter II. The Anthrax | 459 |
| Chapter III. Another Prober (Perforator) | 783 |
| Chapter IV. Larval Dimorphism | 476 |
| Chapter V. Heredity | 595 |
| Chapter VII. The Pond | 764 |
| Chapter VIII. The Caddis Worm | 625 |
| Chapter IX. The Greenbottles | 718 |
| Chapter X. The Gray Flesh Flies | 1816 |
| Chapter XI. The Bumblebee Fly | 631 |
| Chapter XII. Mathematical Memories: Newton's Binomial Theorem | 1969 |
| Chapter XIII. Mathematical Memories: My Little Table | 665 |
| Chapter XIV. The Bluebottle: The Laying | 966 |
| Chapter XV. The Bluebottle: The Grub | 1290 |
| Chapter XVI. A Parasite of The Maggot | 947 |
| Chapter XVII. Recollections of Childhood | 636 |
| Chapter XVIII. Insects and Mushrooms | 1707 |
| Chapter XX. Industrial Chemistry | 865 |
| Chapter VII. The Bluebottle | 1657 |