| Chapter IV. The Mother Decides the sex of the egg | 751 |
| Chapter V. Permutations of Sex | 652 |
| Chapter I. The Terebinth Aphids. | 935 |
| Chapter II. Experiments | 885 |
| Chapter III. Exchanging The Nests | 524 |
| Chapter IV. More Enquiries Into Mason Bees | 1036 |
| Chapter V. The Story of My Cats | 926 |
| Chapter X. The Tribulations of The Mason Bee | 933 |
| Making a Bug Home | 1219 |
