| Chapter IV. The Mother Decides the sex of the egg | 4770 |
| Chapter V. Permutations of Sex | 4991 |
| Chapter I. The Terebinth Aphids. | 5587 |
| Chapter II. Experiments | 5212 |
| Chapter III. Exchanging The Nests | 3889 |
| Chapter IV. More Enquiries Into Mason Bees | 7155 |
| Chapter V. The Story of My Cats | 5339 |
| Chapter X. The Tribulations of The Mason Bee | 6413 |
| Making a Bug Home | 12661 |
