262 FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT

Clays, 3, 53-259 E
 classification of, 69-71 Edgar, C. S., 226
 definition of, 64-65 Edgar Plastic Kaolin Company, 14, 15,
 origin of, 65-66 219, 220, 223, 226, 229, 240
 suitablon brick, 122-124, 127-131, 133, Edgar, kaolin mines, 14, 217, 226, 229,240

 135, 138, 154, 157-160, 214 Edwards, R. J., 212, 213
 drain tile, 122, 127, 129-131, 138, 156, Efflorescence on clay or clay products,
 157, 160, 162, 164, 172,182,186,214 85-88
 face brick, 214 Emery wheels, 106
 fire-proofing, 122, 156, 164, 172, 186 Eocene, 107-108, 110
 furnace lining, 122 Epidote, 78
 hollow blocks, 122, 127, 129, 130, 138, Escambia County, 116, 138-157, 246, 247
 156, 157, 160, 162, 164, 171, 172, Estiffanulga Bluff, 182, 183
 182, 185, 214 Etaieca,7
 road material, 122, 134, 158, 166, 171, Estuarine clay, 70
 174, 177, 186, 192 Expenditures of the Survey, 8-13
 stoneware, 214, turpentine cups, 214 Clay County, (114), 128-132, 235 Clay County Steam Brick Company, 131 F
Clay workers, directory of, (15), 258 Cobb,-S. E., Jr., 5 Face brick, 154, 172, 182, 188, 200, 214,
Collins, Harry L., kaolin of, 238 243, 247, 258
Colluvial clay, 69 Fat clay, 89, 100
Collyrite, 72
Color of clay, 90, 103 Feldspar, 65, 66, 72, 73, 80, 222, 223, 244
Columbia County, (114), 133-134 Filter tubes, 106
Common brick, 162-214 Fire-boxes, 122
Conditions of deposition of kaolin, 224 Fire-brick, 106, 140 Cone, W. N., 134 Fire-clay, 70, 71, 104, 140
Cooke, M. K., 5 Fire-proofing, 105
Cosner, F. D., 63 Fire shrinkage of clay, 101
Crary, J. W., Sr., 140, 242, 259 Flagler County, 157-158
Cream-colored brick, 214
Cretaceous clays, 222, 224, 226 Flint, production of, 17
Crowder, S. B., clay of, 211 Flint clay, 70
Crucibles, 106 Flocculation, 68
Crystal Springs, 193 Flood-plain clays, 68, 70, 110, 117, 161164
 D Florida China Clay Corporation, 15, 225,
Dade City, 192, 193, 240 228, 231-237
Dall, W. H., 28, 33 Florida Diatomite Company, 16
Davis, N. B., writings of, 222, 224, 259 Florida Geological Survey, work of, 6 Description of clay deposits, 122 Florida Industrial School for Boys, 172,
DeSoto County, 134, 183, 235 173
Dexland Bluff, 116, 142, 143, 145, 148, Floridin Company, 160
 149, 151, 152, 155 Flower pots, (106), 214
Dexter, Chas. A., 139, 143 Flues, 106
Diatomaceous earth, 16 Fluxing impurities, 79
Dick, M., 72 Foster Kaolin Co., 240
Distribution of clay deposits, 122 Front brick, 105
Dolomite, 76, 82, 83 Fuller's earth, 16, 62, 63, 113, 121, 160,
Dolores Brick Company, 141, 147, 148, 185, 221, 245, 260
 150, 155, 156 underlying kaolin formation, 237, 240
Drain tile, 214, 243 Fulton, W. A., 63
Dunnellon formation, 115, 260 Furnace linings, 122
Duval County, 135-138 Fusibility of clay, 93-97