| Chapter I. Bramble-Dwellers | 5037 |
| Chapter II. Experiments | 3821 |
| Chapter IV. More Enquiries Into Mason Bees | 4917 |
| Chapter V. The Story of My Cats | 4082 |
| Chapter VI. The Red Ants | 5417 |
| Chapter IX. The Theory of Parasitism | 4349 |
| Chapter VII. The Arbutus Caterpillar | 5896 |
| Chapter VIII. An Insect Virus | 4641 |
| Chapter XIX. A Memorable Lesson | 6585 |
| Chapter XX. Industrial Chemistry | 4090 |
| Chapter VI. The Burying Beetles: Experiments | 3246 |
| Making a Bug Home | 9804 |
