Vi - CONTENTS. 
V. CLASSIFICATION OF Rocks We oh ee oe we 
VI. A DESscRIPTION OF THE MORE IMPORTANT Kinps or Rocks oF THE 
HaARtTH’s CRUST. 
A. Orystalline (including Yai eet 
1. Stratified .. : ods ) wet” ee) 2 orca i 
2. Schistose or Holatede Peer 
3. Massive 
(1) fleldea wee Serie a, Orthoclase Rocks—(a) Quartzi- 
ferous, 131—(B) Quartzless, or poor in quartz, 137—4, Pla- 
gioclase Rocks, 142 — (2) Nepheline Rocks, 150 —(8) 
Leucite Rocks, 150—(4) Olivine Rocks, 151—(5) Ser- 
pentine Rocks, 151. 
B. Fragmental (Clastic) Si 
1. Gravel and Sand Rocks (Psaunmites) 
2. Clay Rocks (Pelites) .. 
3. Volcanic Fragmental Rocks (Tufts) 
4, Fragmental Rocks of Organic Origin ss a 
(1) Calcareous, 165—(2) Siliceous, 168—(3) Phosphatic, 169 
—(4) Carbonaceous, 170—(5) Ferruginous, 174. 
VII. Derermination oF Rocks. 
i. Macroscopic Examination in the field or indoors 
ii. Microscopic Investigation : 
ili, Chemical Analysis 
BOOK ITI. 
DYNAMICAL GEOLOGY, 195. 
PAGE 
108 
110 
110 
118 
129 
153 
154 
160 
161 
165 
176 
182 
191 
Part I.—Hypocenrt Action—An InQuIRY INTO THE GEOLOGICAL CHANGES 
IN PROGRESS BENEATH THE SURFACE OF THE Haru, 196. 
I. VoLcANOES AND VoncANic ACTION. 
1. Volcanic Products .. .. . as 2, S86 ee 
1. Gases and Vapours, 198—2. Wales 202-3. tae 203—4, Fragmen- 
tary Materials, 205. 
2. Voleanie Actions ;,  .. Maps pets 2 os, | =e 
Active, Dormant, and Extinct Phase 208 Sites of Weleaian Action, 209 
—Conditions of Eruption, 210—Occasional Periodicity of Er uptions, 
211—General Sequence of Events in an Eruption, 211—Fissures, 212— 
Explosions, 215—Showers of Dust and Stones, 216—Lava Streams, 
219—Subsidence and Elevation, 232—Torrents of Water and Mud, 
232—Mud Volcanoes, 234—Exhalations of Vapours and Gases, 935— 
Geysers, 236. 
3. Structure of Volcanoes :. .. . 4. os | saeco 
Gi.) Volcanic Cones, 239 — Submarine Volcanoes, 249 — (ii.) Fissure 
(Massive) Eruptions, 255. 
4, Geographical and Geological Distribution of Voleanoes .. .. 
5. Causes of Volcanic Action 
II], HARTHQUAKES ..., son pee Wee os 
Geological Effects, 27 i tpinanucen, 273—Origin, 273. 
197 
208 
239 
259 
260 | 
266 
