CONTENTS. xi 



CHAPTER XIV. 



PHYSICAL CONDITIONS OF THE ANTARCTIC ICE-SHEET. 



Continued. 



PAGE 



Limit to Thickness of the Ice resulting from Melting produced 

 by Pressure. — Supposed Diminution in Thickness of Ice- 

 strata from Compression and Melting. — Centre of Dis- 

 persion. — Ice thickest at Centre of Dispersion. — Thickness 

 at Pole independent of Amount of Snowfall. — Rate of 

 Motion of the Antarctic Ice. — Probable Thickness at the 

 Pole.— Ice of the Glacial Epoch, 224 



CHAPTER XV. 



REGELATION AS A CAUSE OF GLACIER MOTION. 



Why the Problem of Glacier Motion is so difficult. — Heat in Re- 

 lation to Glacier Motion. — Regelation as a Cause of Motion. 

 — Theories of the Cause of Regelation. — How Regelation 

 produces Motion. — Heat transformed into Glacier Motion, 248 



CHAPTER XVI. 



THE TEMPERATURE OF SPACE AND ITS BEARING ON 

 TERRESTRIAL PHYSICS. 



The Importance of Knowing the Temperature of Space. — The 

 Researches of Pouillet and Herschel in reference to the 

 Temperature of Space. — A Defect in Dulong's and Petit's 

 Formula. — Professor Balfour Stewart on Radiation of Thin 

 Plates. — Radiation of Gases, 258 



CHAPTER XVII. 



THE PROBABLE ORIGIN AND AGE OF THE SUN's HEAT. 



Age of the Sun's Heat according to the Gravitation Theories. — 

 Testimony of Geology as to the Age of Life on the Globe. — 

 Evidence from "Faults." — Rate of Denudation. — Age of the 

 Stratified Rocks as determined by the Rate of Denudation, 264 



