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| CHAP. IX. | |
| MODERN EFFECTS OF HEAT ON THE GLOBE. | |
| Page | |
| Remarks | 200 |
| Volcanic Action | 201 |
| Origin of Volcanos | 202 |
| Volcanos in Action | 208 |
| Dispersion of Ashes, Stones, Mud, &c. | 213 |
| Extinction of Volcanos | 216 |
| Extinct Volcanos | 220 |
| Geographical Distribution of Volcanos. | 221 |
| Asiatic Volcanos | 227 |
| American Volcanos | 229 |
| African Volcanos | 231 |
| Australian | 232 |
| Indian Ocean | 232 |
| Pacific Ocean | 232 |
| Geological Age of Volcanos | 233 |
| Volcanic Eruption Forces.─Earthquakes | 234 |
| Ejection of Ashes and Stones | 235 |
| New Mountains formed | 236 |
| New Islands raised | 236 |
| Earthquakes | 242 |
| Hypotheses of Volcanic Action | 248 |
| Thermal Springs | 252 |
| Warm Springs of the British Islands, yielding Nitrogen, &c. | 255 |
| Warm Springs of a Part of Germany, &c., yielding Carbonic Acid, &c. | 256 |
| Warm Springs of the Pyrenees | 256 |
| Warm Springs of Volcanic Countries | 257 |
| Summary of their Geological Relations to existing Volcanos | 259 |
| Experimental Inquiries into the Heat of the Globe | 262 |
| First Class of Experiments.—Metalliferous Veins | 270 |
| Tables of Temperatures of Water at different Depths in the Mines of Freyberg | 270 |
| Account of Temperatures of Water at different Depths in various Countries | 271 |
| Second Class of Experiments.—Stratified Rocks | 272 |
| Account of the Temperatures of Water at various Depths in different Mines | 273 |
| Cordier's Summary of Observations in the Coal Mines of Carmeaux, Littry, and Decise | 274 |
| Summary of Observations on Subterranean Temperatures in Rocks | 275 |
| Third Class of Experiments.—Artesian Wells | 276 |
| Tables of Temperatures of Water, with Mean Results | 276 |
