| Chapter IV. The Mother Decides the sex of the egg | 6681 |
| Chapter V. Permutations of Sex | 6743 |
| Chapter I. The Terebinth Aphids. | 7390 |
| Chapter II. Experiments | 7457 |
| Chapter III. Exchanging The Nests | 5836 |
| Chapter IV. More Enquiries Into Mason Bees | 9315 |
| Chapter V. The Story of My Cats | 7074 |
| Chapter X. The Tribulations of The Mason Bee | 8441 |
| Making a Bug Home | 15081 |
