| Chapter IV. The Mother Decides the sex of the egg | 4798 |
| Chapter V. Permutations of Sex | 5018 |
| Chapter I. The Terebinth Aphids. | 5619 |
| Chapter II. Experiments | 5249 |
| Chapter III. Exchanging The Nests | 3921 |
| Chapter IV. More Enquiries Into Mason Bees | 7192 |
| Chapter V. The Story of My Cats | 5370 |
| Chapter X. The Tribulations of The Mason Bee | 6453 |
| Making a Bug Home | 12706 |
