SECTION AT JOINVILLE 54

ORBITS OF THE PERIODIC COMETS 83

ORBIT OF EARTH AND COMET 88

THE EARTH'S ORBIT 89

THE COMET SWEEPING PAST THE EARTH 92

THE SIDE OF THE EARTH STRUCK BY THE COMET 93

THE SIDE NOT STRUCK BY THE COMET 93

THE GREAT COMET OF 1811 95

CRAG AND TAIL 98

SOLAR SPECTRUM 105

SECTION AT ST. ACHEUL 122

THE ENGIS SKULL 124

THE NEANDERTHAL SKULL 125

PLUMMET FROM SAN JOAQUIN VALLEY, CALIFORNIA 180

{p. v}