| Chapter IV. The Mother Decides the sex of the egg | 3895 |
| Chapter V. Permutations of Sex | 4056 |
| Chapter I. The Terebinth Aphids. | 4708 |
| Chapter II. Experiments | 4246 |
| Chapter III. Exchanging The Nests | 3124 |
| Chapter IV. More Enquiries Into Mason Bees | 6191 |
| Chapter V. The Story of My Cats | 4450 |
| Chapter X. The Tribulations of The Mason Bee | 5432 |
| Making a Bug Home | 10989 |
