| Chapter VI. Instinct And Discernment | 2275 |
| Chapter VII. Economy of Energy | 1840 |
| Chapter II. The Pine Processsionary: The Nest; The Community | 1284 |
| Chapter III. The Pine Processionary: The Procession | 1483 |
| Chapter IV. The Pine Processionary: Meteoroogy | 2639 |
| Chapter VIII. The Pine Processionary | 1200 |
| Chapter XIV. The Cabbage Caterpillar | 2552 |
