CONTENTS. 



PAOE 



INTRODUCTION 5 



CHAPTER I. 

 The constituents of igneous rocks 11 



CHAPTER II. 



The chemical characters of igneous rocks ... ... ... 37 



CHAPTER III. 



The physical characters of igneous rocks ... ... 47 



CHAPTER IV. 

 The classification of igneous rocks 62 



CHAPTER V. 



The ultra-basic rocks ...... ... 79 



CHAPTER VI. 



On serpentine ... ... ... .. ... ... ... ... 104 



CHAPTER VII. 



The basic igneous rocks ... ... ... ... ... ... ... 131 



CHAPTER VIII. 

 The igneous rocks of intermediate composition ... ... ... 253 



CHAPTER IX. 



The igneous rocks of acid composition ... ... ... ... ... 290 



CHAPTER X. 

 The mica-traps and related rocks 350 



CHAPTER XI. 

 The nepheline and leucite rocks ... ... ... ... ... ... 358 



CHAPTER XII. 



On contact-metamorphism ... ... ... ... ... ... 373 



CHAPTER XIII. 

 The origin of igneous rocks 39.1 



CHAPTER XIV. 

 The metamorphosis and destruction of igneous rocks 410 



