Laccolites, 123 Lacroix, A., 15, 125, 150 Lake, P., 76 Lamellibranchs, 22 Lamplugh, G. W., 89 Landslips, 46, 94 Lapworth, C., ref. 39 Laterisation, 64 Laurentian gneiss, 158 Lautaret Pass, 95 Lava-flows, 113 Lava-plains, 114 Lawson, A. D., 125, 158 Lehmann, J., 157 Leinster granite, 143 Leith, C. K., 89 Leith Hill, 73 Leonhard, K. von, 3 Lepsius, R., 125, ref. 97 Lessing, L., ref. 77 Lévy, M., 6, 125, 150, 156 Limestones, 12, 150; deposited from solution, 14; organic, 19 Linck, G., 16, 18, 61 _Lit-par-lit_ injection, 157 Lithoidal structure, 108 Lithothamnium, 20, 29 Little, O. H., ref. 8 Llanberis, 96 Loam, 82 Londonderry, Co., 135 Lossen, K. A., 157 Lower Greensand, 62, 73 Lundy Id., 139 Lyons, H. G., 63 Macculloch, J., 142 Magmas, igneous, 127 Magmatic differentiation, 128 Magnesian limestone, 35 Magnesium in organic skeletons, 29 Marble, 36, 54, 150 Marl, 83 Martel, E. A., 52 Matopo Hills, 140 Matterhorn, 143 Metamorphic Rocks, 143 Mica-Schist, 147, 161 Millepora, 25 Millersdale, 48 Minerals, 6, 8 Mojsisovics, E., 27 Monaghan, Co., 74 Mont Blanc, 138, 143 Mont Genèvre, 117 Mull, 135 Murray, J., 25 Nagelfluh, 14 New Forest, 74 Northumberland, 136 Norway, 162 Nubian Sandstone, 63 Nummulitic limestone, 21 Obsidian, 132 Old Red Sandstone, 75 Oolitic grains, 15, 17 Oolitic Limestone, 18, 40 Ophicalcite, 36 Order of crystallisation of minerals, 108 Ox Mountains, 158 Paris basin, 40, 74 Petrographical provinces, 130 Pfaff, 30, 34 Phillips, J. A., 64, 67 Phillips, W., 35 Phosphatic limestone, 36 Phosphorites du Quercy, 37 Pillow-structure, 117 Pipe-clay, 78 Pisolite, 15, 18 Planetesimal theory, 129, 130, 159 Plutonic conditions, 119 Porosity of sandstone, 66; of clay, 79 Porphyritic structure, 119 Portland stone, 18 Portrane, ref. 11 Purbeck Marble, 54 Pyroxenite, 148 Quartz veins, 56, 65 Quartz-felsite, 132 Quartzite, 63, 76, 151, 161 Quartz-porphyry, 132 Radiolaria, 40, 118 Ravines in limestone, 48 Reade, T. M., 83, 90 Red Clay of deep seas, 88 Regional metamorphism, 157 Reynolds, S. H., 29 Rhodesia, 140 Rhyolite, 132 Richthofen, F. von, 25, 27 Ripple-marks, 69 Rock, definition of, 7 Roestone, 15 Rogers, A. W., 41, 62, 63 Rosenbusch, H., 6, ref. 58 Rothpletz, A., 27 Russell, E., 82 Russell, I., ref. 56