Bagshot clays and sands, 64, 125 Ball clays, 6, 19, 28, 62, 64, 82, 110, 115, 119, 125, 138, 141, 156, 166 Bending of clay, 33 Bibliography, 168 Binding power, 28, 151 Binds, 53 Bituminous shales, 57, 59 Black spots, 14, 128 Black ware, 113 Bleaching oil, 134 Blue bricks, 13, 56 Bone-ash, 110 Boulder clays, 3, 7, 10, 65, 101 Bovey Tracey clay, 62 Brick clays, earths and shales, 1, 2, 5, 10, 11, 12, 13, 31, 37, 40, 46, 56, 57, 59, 61, 63, 65, 67, 68, 91, 100, 101, 104, 112, 117, 123, 125, 129, 138, 162, 166 Brittleness, 46 Brown ware, 113 Buff bricks, 128 Burned clay, 28, 31, 41, 119, 121 Calcareous clays, 38, 61, 68, 88, 133, 139, 166 Calcareous sands, 88 Calcium, see _Lime compounds_ Cambrian clays, 51 Carbon in clay, 15, 119, 144 Carbonates in clay, 10, 82 Carboniferous clays and shales, 52, 124 Carboniferous limestone, 52, 108 Carclazite, 78, 106 Cellulose in clays, 27 Cement clays, 57, 104, 131 Chalcopyrite, 14 Chalk, 10, 11, 61, 67, 68, 88, 116, 127, 128, 132, 134, 139 Chamotte, 121 Chemical properties of clay, 6 China clay rock, 78, 106, 116 China clays, 2, 5, 6, 7, 9, 22, 27, 40, 49, 64, 71, 75, 78, 82, 84, 104, 110, 116, 141, 146, 147, 148, 156, 165 China-ware, 109, 110 Chinese clay, 73 Classification of clays, 163 Clay molecule, 156 Clay-shales, 122 Clay substance, 135 _et seq._ Clay substance, defined, 150 Clayite, 83, 107, 147, 149 Clinker, 132 Clunches, 118 Coagulated clays, 97 Coagulation, 43, 152 Coal Measure clays and shales, 53, 96, 103, 117, 124, 130 Coarse pottery, 112 Cobalt, 110 Colloid theory, 97 Colloidal properties of clay, 25, 81, 82, 97, 106, 147, 150, 152 Colloidal silica, 81, 134, 157 Colloids, 24, 41, 43, 76, 160 Colluvial clays, 99 Colours of burned ware, 19, 123, 131 Colours of clays and shales, 19, 59, 115, 119, 124, 126 Combined water, 45, 154 Common clays, 3 Composition of clays, 4, 6, 16, 23, 35, 44, 107, 117, 118, 133, 134, 144, 156, 164 Composition of clays (burned), 46 Cornish stone, 110, 116 Cracked ware, 46, 127, 130, 131 'Cream,' 39, 43, 152 Cretaceous clays, 61 'Crumb' of clay, 24 Crushing clay, 45 'Crystalline' clay, 107, 146, 148 Crystals in clay-ware, 46 Decantation, 139 Decomposition of clay, 154 Definitions of clay, 2-5, 120, 135, 149, 150 De-greasing wool, 134 Deposition of clays, 49, 51, 90, 99 Devonian clays, 51 Diluvial clays, 99 Dinas rock, 54 Disintegration, 102 Distribution of clays, 1 Drain-pipe clays, 112, 113 Drift, 65, 101 Drift clays, 101 Drying clays, 27, 127, 153 Durability, 131 Dyes, 41, 150 Earth movements, 85, 96 Earthenware, 37, 112 Earths for bricks, see _Brick clays_ Electrolytes, 43 Elutriation, 8, 137, 140 Eocene clays, 63 Epigenic clays, 82 Erosion, 89, 99, 100 Estuarine clays, 90, 93, 118 Etruria marls, 55, 130 Expansion, 32 Exposure, 43