Penny Blood: Serial Sensation and Working-Class Entertainment — page 15: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

x CONTENTS. CHAPTER XVII. . GEOLOGICAL MOVEMENTS EXPLAINED. Recapitulation of the four suggested causes of compression—Three of them negatived—The fourth possibly the true one—The fact of compression certain, and the duplex character of the corrugations most probable—The conse- quences of denudation followed out—Elevation ita correlative—Fresh-water strata covered by marine— Movements most energetic near, but not confined to, continents—Degradation of mountains a law of nature—Enormous thickness of certain strata accounted for—Raised sea beaches—Two classes of elevatory movements—Drainage across dip-—T heories of compression compared . 217 CHAPTER XVIII. MR MALLET’S THEORY OF VOLCANIC ENERGY. Early opinions regarding the seat of volcanic energy—Hopkins’ lava lakes— Mallet’s theory—Opposed to the results of the present work—His mode of estimating the temperature derivable from crushing rock—His results pub- lished in the “Phil. Trans.”—differ from those given in an earlier publica- tion—Latent heat of fusion—Localization of heat from crushing not possible —More favourable hypothesis suggested and considered—A pressure, the greatest obtainable on the hypothesis, incapable of causing volcanic phe- CHAPTER XIX. THE VOLCANO IN ERUPTION. Theories of volcanic eruption—Scrope, Dutton, Mallet—Local and temporary in- crease of tenperature not probable—Richthofen’s theory unsatisfactory—Ez- planation of phenomena on hypothesis of fluid substratum in igneo-aqueous fuston—Amount of water-substance beneath vent probably variable—Mechanics of an eruption—Estimate of amount of water-substance in magma—Eruption, how brought to an end—Eviseeration of cone—State of intermediate activity— Stromboli—Unsympathetic craters—Richthofen’s difficulties met—Renewal of activity—Comparison with Geyser. , , . , ; . 240 GOnMGOOOkKS (CO) e a si CR