ILLUSTRATIONS 



PIG. PAGE 



1. Larva of Chcerocampa porcellus 53 



2. Bougainvillea f ruticosa ; natural size. (After All- 



man) 107 



3. Do. do. magnified .... 108 



4. Do. do. Medusa-form . . .109 



5. Medusa aurita, and progressive stages of development. 



(After Steenstrup) 110 



6. White Dead-nettle 124 



7. Do. 125 



8. Do. 125 



9. Salvia 127 



10. Do 127 



11. Do 127 



12. Primrose 131 



13. Do. 131 



14. Arum 135 



15. Twig of Beech 140 



16. Arrangement of leaves in Acer platanoides . . 142 



17. Diagram to illustrate the formation of Mountain 



Chains 216 



18. Section across the Jura from Brenets to Neuchatel. 



(After Jaccard) 219 



19. Section from the Spitzen across the Brunnialp, and 



the Maderanerthal. (After Heim) . . . 221 



