| Chapter IV. The Mother Decides the sex of the egg | 4736 |
| Chapter V. Permutations of Sex | 4963 |
| Chapter I. The Terebinth Aphids. | 5559 |
| Chapter II. Experiments | 5177 |
| Chapter III. Exchanging The Nests | 3864 |
| Chapter IV. More Enquiries Into Mason Bees | 7120 |
| Chapter V. The Story of My Cats | 5311 |
| Chapter X. The Tribulations of The Mason Bee | 6373 |
| Making a Bug Home | 12617 |
