Plate 27. Nervous System 711 Plate 28. Cementing Apparatus 712 Plate 29. Cirri: Larvæ, first stages 713 Plate 30. Larvæ, last stages 714 GEOLOGICAL OBSERVATIONS ON SOUTH AMERICA By Charles Darwin CONTENTS EDITORIAL NOTE. DETAILED TABLE OF CONTENTS. GEOLOGICAL OBSERVATIONS ON SOUTH AMERICA CRITICAL INTRODUCTION. CHAPTER I. ON THE ELEVATION OF THE EASTERN COAST OF SOUTH AMERICA. CHAPTER II. ON THE ELEVATION OF THE WESTERN COAST OF SOUTH AMERICA. CHAPTER III. ON THE PLAINS AND VALLEYS OF CHILE:—SALIFEROUS SUPERFICIAL DEPOSITS. CHAPTER IV. ON THE FORMATIONS OF THE PAMPAS. CHAPTER V. ON THE OLDER TERTIARY FORMATIONS OF PATAGONIA AND CHILE. CHAPTER VI. PLUTONIC AND METAMORPHIC ROCKS:—CLEAVAGE AND FOLIATION. CHAPTER VII. CENTRAL CHILE:—STRUCTURE OF THE CORDILLERA. CHAPTER VIII. NORTHERN CHILE. CONCLUSION. THE DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES By Charles Darwin CONTENTS DETAILED TABLE OF CONTENTS INTRODUCTION. THE DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES. INTRODUCTION. CHAPTER I. HETEROSTYLED DIMORPHIC PLANTS: PRIMULACEAE. CHAPTER II. HYBRID PRIMULAS. CHAPTER III. HETEROSTYLED DIMORPHIC PLANTS—continued. CHAPTER IV. HETEROSTYLED TRIMORPHIC PLANTS. CHAPTER V. ILLEGITIMATE OFFSPRING OF HETEROSTYLED PLANTS. CONCLUSIONS WITH RESPECT TO THE EQUAL-STYLED VARIETY OF P. Sinensis. CHAPTER VI. CONCLUDING REMARKS ON HETEROSTYLED PLANTS. CHAPTER VII. POLYGAMOUS, DIOECIOUS, AND GYNO-DIOECIOUS PLANTS. CHAPTER VIII. CLEISTOGAMIC FLOWERS. THE EFFECTS OF CROSS & SELF-FERTILISATION IN THE VEGETABLE KINGDOM. By Charles Darwin CONTENTS DETAILED TABLE OF CONTENTS THE EFFECTS OF CROSS AND SELF-FERTILISATION IN THE VEGETABLE KINGDOM. CHAPTER I. INTRODUCTORY REMARKS. CHAPTER II. CONVOLVULACEAE. CHAPTER III. SCROPHULARIACEAE, GESNERIACEAE, LABIATAE, ETC. CHAPTER IV. CRUCIFERAE, PAPAVERACEAE, RESEDACEAE, ETC. CHAPTER V. GERANIACEAE, LEGUMINOSAE, ONAGRACEAE, ETC. CHAPTER VI. SOLANACEAE, PRIMULACEAE, POLYGONEAE, ETC. CHAPTER VII. A SUMMARY OF THE HEIGHTS AND WEIGHTS OF THE CROSSED AND SELF-FERTILISED PLANTS. CHAPTER VIII. DIFFERENCE BETWEEN CROSSED AND SELF-FERTILISED PLANTS IN CONSTITUTIONAL VIGOUR AND IN OTHER RESPECTS. CHAPTER IX. THE EFFECTS OF CROSS-FERTILISATION AND SELF-FERTILISATION ON THE PRODUCTION OF SEEDS. CHAPTER X. MEANS OF FERTILISATION. CHAPTER XI. THE HABITS OF INSECTS IN RELATION TO THE FERTILISATION OF FLOWERS. CHAPTER XII. GENERAL RESULTS.