CONTENTS. 



EDITOR'S PREFACE 



INTRODUCTION to the special results of observation in the 



domain of terrestrial phenomena 3-12 



FIRST SECTION 13-161 



General remarks . . . . . . . .13-15 



Magnitude, figure and density of the Earth . . . 16-33 

 Internal heat of the Earth and its distribution . . . 34-48 

 Magnetic activity of the Earth . . . . . 49-161 



Historic portion 49-93 



Intensity of the magnetic force .... 93-108 



Inclination 108-125 



Declination 125-153 



Polar light or aurora 153-161 



SECOND SECTION: 



Reaction of the interior of the Earth on its exterior . . 162-448 



General remarks 162-166 



Earthquakes (dynamic action) 166-184 



Thermal springs 184-206 



Springs of vapour and gas, salses, mud volcanoes, 



and naphtha springs 206-221 



Volcanoes . . . 221-448 



