| Chapter VI. Instinct And Discernment | 2879 |
| Chapter VII. Economy of Energy | 2389 |
| Chapter II. The Pine Processsionary: The Nest; The Community | 1907 |
| Chapter III. The Pine Processionary: The Procession | 2576 |
| Chapter IV. The Pine Processionary: Meteoroogy | 3436 |
| Chapter VIII. The Pine Processionary | 1846 |
| Chapter XIV. The Cabbage Caterpillar | 3928 |
