| Chapter IV. The Mother Decides the sex of the egg | 1451 |
| Chapter V. Permutations of Sex | 1380 |
| Chapter I. The Terebinth Aphids. | 1849 |
| Chapter II. Experiments | 1632 |
| Chapter III. Exchanging The Nests | 1069 |
| Chapter IV. More Enquiries Into Mason Bees | 1963 |
| Chapter V. The Story of My Cats | 1755 |
| Chapter X. The Tribulations of The Mason Bee | 1972 |
| Making a Bug Home | 3076 |
