| Chapter VI. Instinct And Discernment | 134 |
| Chapter VII. Economy of Energy | 133 |
| Chapter II. The Pine Processsionary: The Nest; The Community | 133 |
| Chapter III. The Pine Processionary: The Procession | 161 |
| Chapter IV. The Pine Processionary: Meteoroogy | 118 |
| Chapter VIII. The Pine Processionary | 142 |
| Chapter XIV. The Cabbage Caterpillar | 175 |