Penny Blood: Serial Sensation and Working-Class Entertainment — page 10: what you’re looking at

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

CONTENTS. CHAPTER I. ON UNDERGROUND TEMPERATURE. The rise of temperature on descending into the earth—The causes which have been assigned for it—Attempts to determine the law of increase by observation— Their results—Deep bore-hole at Sperenberg and methods of observation used there—General effects of convection currents in a bore-hole—Tabulated obser- vations at Sperenberg—Anomalous result supposed to be deducible therefrom— Anomaly explained—General law of average rise of temperature not impaired thereby—Hot springs and volcanos prove that the rise of temperature con- tinues, but do not inform us whether the law near the surface obtains unaltered for all depths : : e e ; . . . . ‘ - dt CHAPTER IT. CONDITION OF INTERIOR. Little known about the condition of the interior of the earth—Results of the mathe- matical ‘*Theory of the Earth” point to a former condition of fluidity— Determination of the mean and surface densities—The question proposed whether the fluid condition still partially exists more or less—Connection be- tween this question and that of the law of internal temperature—Two modes of attaoking the question, (1) Precession, (2) the tides—Opinions of Sir Wm. Thomson, Hopkins, Delaunay, and others—Possibility J a cooled crust resting on an internal fluid layer ; ‘ ‘ . ‘ . 18 CHAPTER III. INTERNAL DENSITIES AND PRESSURES. Speculations concerning the materials in successive couches—Waltershausen’s theory—His law of density open to correction— Hts tables of densities and pressures—Fluid pressures within the earth calculated = Laplace’s law of density—Fluid pressure at the centre. , . - 28 COMIC OOOKS.EO