| Chapter IV. The Mother Decides the sex of the egg | 1869 |
| Chapter V. Permutations of Sex | 1830 |
| Chapter I. The Terebinth Aphids. | 2415 |
| Chapter II. Experiments | 2076 |
| Chapter III. Exchanging The Nests | 1413 |
| Chapter IV. More Enquiries Into Mason Bees | 2644 |
| Chapter V. The Story of My Cats | 2219 |
| Chapter X. The Tribulations of The Mason Bee | 2660 |
| Making a Bug Home | 4940 |
