| Chapter IV. The Mother Decides the sex of the egg | 4891 |
| Chapter V. Permutations of Sex | 5127 |
| Chapter I. The Terebinth Aphids. | 5719 |
| Chapter II. Experiments | 5362 |
| Chapter III. Exchanging The Nests | 4013 |
| Chapter IV. More Enquiries Into Mason Bees | 7281 |
| Chapter V. The Story of My Cats | 5469 |
| Chapter X. The Tribulations of The Mason Bee | 6563 |
| Making a Bug Home | 12843 |
