| Chapter IV. The Mother Decides the sex of the egg | 3417 |
| Chapter V. Permutations of Sex | 3537 |
| Chapter I. The Terebinth Aphids. | 4183 |
| Chapter II. Experiments | 3734 |
| Chapter III. Exchanging The Nests | 2710 |
| Chapter IV. More Enquiries Into Mason Bees | 4840 |
| Chapter V. The Story of My Cats | 4005 |
| Chapter X. The Tribulations of The Mason Bee | 4925 |
| Making a Bug Home | 9675 |
