| Chapter IV. The Mother Decides the sex of the egg | 4989 |
| Chapter V. Permutations of Sex | 5231 |
| Chapter I. The Terebinth Aphids. | 5826 |
| Chapter II. Experiments | 5484 |
| Chapter III. Exchanging The Nests | 4104 |
| Chapter IV. More Enquiries Into Mason Bees | 7375 |
| Chapter V. The Story of My Cats | 5565 |
| Chapter X. The Tribulations of The Mason Bee | 6674 |
| Making a Bug Home | 12986 |
