| Chapter I. Bramble-Dwellers | 7778 |
| Chapter II. Experiments | 5915 |
| Chapter IV. More Enquiries Into Mason Bees | 7813 |
| Chapter V. The Story of My Cats | 6000 |
| Chapter VI. The Red Ants | 8818 |
| Chapter IX. The Theory of Parasitism | 6408 |
| Chapter VII. The Arbutus Caterpillar | 8269 |
| Chapter VIII. An Insect Virus | 7115 |
| Chapter XIX. A Memorable Lesson | 8386 |
| Chapter XX. Industrial Chemistry | 5972 |
| Chapter VI. The Burying Beetles: Experiments | 5045 |
| Making a Bug Home | 13510 |
