VI. WAS IT CAUSED BY A CONTINENTAL ICE-SHEET? 23

VII. THE DRIFT A GIGANTIC CATASTROPHE 43

VIII. GREAT HEAT A PREREQUISITE 58

PART II.
THE COMET.

I. A COMET CAUSED THE DRIFT 63

II. WHAT IS A COMET? 65

III. COULD A COMET STRIKE THE EARTH? 82

IV. THE CONSEQUENCES TO THE EARTH 91

{p. iii}

PART III.
THE LEGENDS.

I. THE NATURE OF MYTHS 113

II. DID MAN EXIST BEFORE THE DRIFT? 121

III. LEGENDS OF THE COMING OF THE COMET 132

IV. RAGNAROK 141