mineral outcrops, 316-317

Washington, arsenic, 250
chromite, 179
magnesite, 191-193

Water, applications of economic geology to, 68
as a mineral resource, 61, 62, 67-79
general geologic relations, 67-68
hygroscopic, defined, 68
of constitution, defined, 68
quantity absorbed by soils and rocks, 69
relative abundance of, 18
source of, 67
use of, litigation arising from, 357-358
_See also_ Ground-waters, Surface waters, Hot waters, Meteoric
waters, Magmatic waters.

Water power, possibilities of substituting for coal, 378-379

Water supplies, 72-78

Water supply maps for military use, 411-412

Water table, defined, 70
_See also_ Ground-water level.

Waters, thermal, 72

Watson, T. L., and Ries, H., 413

Weathering, of igneous rocks and veins, 20-22
of igneous rocks, formation of mineral deposits by, 50
of mineral deposits, 46-50
of sedimentary rocks, 23-24
production of clay by, 91
production of soils by, 94-96
zone of, 70

Welfare work, in interests of conservation, 372-373

Wells, 72-73

West Africa, gold, 222
manganese, 176

West Indies, cement, 87
phosphates, 105, 106
salt, 294

West Virginia, bromine, 277
coal, 117
grindstones and pulpstones, 269
natural gas, 151
petroleum, 132, 133

Whetstones, 269

White, David, 128, 129, 140, 143, 146

White Signal district, New Mexico, uranium and radium ores, 265-266

Wisconsin, artesian wells, 73
diamonds in glacial drift, 292, 317
granite, 82
iron. _See_ Lake Superior iron ores, Gogebic district, etc.
quartzite, 82, 84, 195
zinc, 216

Wisconsin, equated income method of taxation, 335-336
taxation of iron ores, 335

Witwatersrand, South Africa, gold ores, 228

Wolfram ores. _See_ Tungsten ores.

Woodward, H. B., 69

Wyoming, chromite, 179
oil shales, 151
petroleum, 133
phosphates, 105
platinum, 239
potash, 112
uranium and radium ores, 265

Yellow Pine district, Nevada, platinum ores, 239-240

Yellowstone Park, springs and geysers of, 72

Zinc and lead ores, Wisconsin, equated income method of taxation, 335-336

Zinc ores, 36-50, 54-55, 213-220, 308, 313-314, 398

Zinc Syndicate, German, 215

Zirconium ores, 189-190, 398

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