| Chapter IV. The Mother Decides the sex of the egg | 743 |
| Chapter V. Permutations of Sex | 644 |
| Chapter I. The Terebinth Aphids. | 930 |
| Chapter II. Experiments | 873 |
| Chapter III. Exchanging The Nests | 522 |
| Chapter IV. More Enquiries Into Mason Bees | 1030 |
| Chapter V. The Story of My Cats | 908 |
| Chapter X. The Tribulations of The Mason Bee | 924 |
| Making a Bug Home | 1207 |
