| Chapter I. Bramble-Dwellers | 1815 |
| Chapter II. Experiments | 1632 |
| Chapter IV. More Enquiries Into Mason Bees | 1963 |
| Chapter V. The Story of My Cats | 1755 |
| Chapter VI. The Red Ants | 1539 |
| Chapter IX. The Theory of Parasitism | 1317 |
| Chapter VII. The Arbutus Caterpillar | 2225 |
| Chapter VIII. An Insect Virus | 1555 |
| Chapter XIX. A Memorable Lesson | 3006 |
| Chapter XX. Industrial Chemistry | 1433 |
| Chapter VI. The Burying Beetles: Experiments | 1305 |
| Making a Bug Home | 3076 |
