| Chapter IV. The Mother Decides the sex of the egg | 4727 |
| Chapter V. Permutations of Sex | 4952 |
| Chapter I. The Terebinth Aphids. | 5547 |
| Chapter II. Experiments | 5169 |
| Chapter III. Exchanging The Nests | 3858 |
| Chapter IV. More Enquiries Into Mason Bees | 7108 |
| Chapter V. The Story of My Cats | 5297 |
| Chapter X. The Tribulations of The Mason Bee | 6359 |
| Making a Bug Home | 12606 |
