Henry W. Longfellow_ 50

WHAT BECOMES OF THE RAIN? 51

THE SOIL IN FIELDS AND GARDENS 58

THE WORK OF EARTHWORMS 63

QUIET FORCES THAT DESTROY ROCKS 68

HOW ROCKS ARE MADE 72

GETTING ACQUAINTED WITH A RIVER 78

THE WAYS OF RIVERS 84

THE STORY OF A POND 90

THE RIDDLE OF THE LOST ROCKS 93

THE QUESTION ANSWERED 96

GLACIERS AMONG THE ALPS 98

THE GREAT ICE SHEET 104

FOLLOWING SOME LOST RIVERS 110

THE MAMMOTH CAVE OF KENTUCKY 114

LAND BUILDING BY RIVERS 121

THE MAKING OF MOUNTAINS 126

THE LAVA FLOOD OF THE NORTHWEST 130

THE FIRST LIVING THINGS 134

AN ANCIENT BEACH AT EBB TIDE 138

THE LIME ROCKS 147

THE AGE OF FISHES 152

KING COAL 155

HOW COAL WAS MADE 160

THE MOST USEFUL METAL 167

THE AGE OF REPTILES 175

THE AGE OF MAMMALS 180

THE HORSE AND HIS ANCESTORS 186

THE AGE OF MAN 194

_PART II. THE SKY_

EVERY FAMILY A "STAR CLUB" 201

THE DIPPERS AND THE POLE STAR 207

CONSTELLATIONS YOU CAN ALWAYS SEE 213

WINTER CONSTELLATIONS 219

ORION, HIS DOGS, AND THE BULL 223

SEVEN FAMOUS CONSTELLATIONS 231

THE TWENTY BRIGHTEST STARS 239

HOW TO LE