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| Internal Divisions of Igneous Rocks | 108 |
| Phenomena Observed where Igneous Rocks come in contact with Stratified Masses | 109 |
| Induration of Stratified Rocks | 109 |
| Alteration of the Structure of Rocks by Heat | 111 |
| Metamorphic Rocks | 125 |
| Re-arrangement of the Particles of Rocks | 126 |
| Alteration of the Chemical Nature of Rocks | 131 |
| Dolomitic Limestone | 133 |
| Generation of New Minerals | 136 |
| Metamorphic Slates | 139 |
| Succession of Metamorphic Slates | 140 |
| Metamorphic Mica Schist, Gneiss, &c. | 143 |
| Relative Antiquity of Pyrogeuous Rocks | 145 |
| Table of the Principal Disturbances of the Stratification of the British Islands, with the Igneous Rocks observed in connection therewith | 152 |
| Class I.─Before the Deposition of Old Red Sandstone | 152 |
| Class II.─Before the Deposition of the Lias | 153 |
| Class III.─Before the Deposition of the Lower Green Sand | 154 |
| Class IV.─Since the Deposition of the Chalk | 154 |
| CHAP. VIII. | |
| MINERAL VEINS. | |
| Remarks | 155 |
| Geographical Distribution | 156 |
| Occurrence of Mineral Veins near Centres of Igneous Action | 159 |
| Relations of Veins to the Substance and Structure of the Neighbouring Rocks | 163 |
| Relation of Veins to each other | 171 |
| First Class.─Oldest Tin Veins | 171 |
| Second Class.─More recent Tin Lodes | 171 |
| Third Class.─Oldest East and West Copper Lodes | 172 |
| Fourth Class.─Contra Copper Lodes | 172 |
| Fifth Class.─Cross Courses | 173 |
| Sixth Class.─More recent Copper Lodes | 173 |
| Seventh Class.─Cross Flukans | 173 |
| Eighth Class.─Slides | 173 |
| Deposits of Metallic Veins in Cornwall | 174 |
| Theory of Mineral Veins | 177 |
| Veins are of posterior Date to the Rocks which they traverse | 178 |
| Description of Huel Peever Vein | 180 |
| Origin of Vein Fissures | 188 |
| Filling of the Fissures | 192 |
| Recapitulation | 196 |
