| Chapter IV. The Mother Decides the sex of the egg | 4663 |
| Chapter V. Permutations of Sex | 4894 |
| Chapter I. The Terebinth Aphids. | 5489 |
| Chapter II. Experiments | 5092 |
| Chapter III. Exchanging The Nests | 3794 |
| Chapter IV. More Enquiries Into Mason Bees | 7037 |
| Chapter V. The Story of My Cats | 5236 |
| Chapter X. The Tribulations of The Mason Bee | 6280 |
| Making a Bug Home | 12532 |
