| Chapter I. Bramble-Dwellers | 8860 |
| Chapter II. Experiments | 7065 |
| Chapter IV. More Enquiries Into Mason Bees | 8974 |
| Chapter V. The Story of My Cats | 6826 |
| Chapter VI. The Red Ants | 10507 |
| Chapter IX. The Theory of Parasitism | 7234 |
| Chapter VII. The Arbutus Caterpillar | 9231 |
| Chapter VIII. An Insect Virus | 8157 |
| Chapter XIX. A Memorable Lesson | 9080 |
| Chapter XX. Industrial Chemistry | 6761 |
| Chapter VI. The Burying Beetles: Experiments | 6156 |
| Making a Bug Home | 14641 |
