INDKX 



Geology, incentives to a study of, 

 i 



economic, 36 

 Glaciation, 203 

 Glaciers, transport of stones by, 



203 



Glassy texture of rocks, 63 

 Glauconite, 232 



as a colouring ingredient of 



rocks, 70 

 Gneiss, 179, 180 



Lewisian, 142 

 Granite, a compound rock, 62 



weathering of, 57 



texture of, 60, 6 1 note 



bosses of, 1 66 



Granophyre, structure of, 61 note 

 Graphite, 228 



:y, specific, 220 

 Green, A. H., cited, 107 

 Green, as a colour of rocks, 70 

 Greenstone, origin of colour of, 



7i 



Grey, as a colour of rocks, 70 

 Grit, defined, 65 

 Gypsum, 233 



a simple rock, 61 



Haematite. 68, 70, 229 



Hade of faults, 1 3 1 



Hammer, use and shape of, 21, 

 IS* 



Hardness of rocks, 67, 218 



Harker, Mr. A., cited, 250 note 



Hatch. Dr. F. H. , cited, 250 note 



Hauy"ne, 230 



Hayden, F. V., 40, 49 



Heavy liquids, separation of mine- 

 rals by means of, 221 



Highlands of Scotland, boundary- 

 fault of. 132, 138 

 metamorphic rocks of, 183, 186 

 persistent limestone bands of, 



183 

 thrust planes of, 142 



Horizons, selection of geological, 

 1 08 



Horizontal sections, 211 



ntality of strata, 102 

 I I'.inblcnde, 179, 231 

 as a colouring ingredient <>(' 



rocks, 69 

 Hornblende- rock, 61 



ire of rocks, 63 

 Hydro-carbons, important, 334 



Ice, IT stones by, 203 



determination of direction of 



movement of, 205, 206 

 Icebergs, 203 



Ice-worn rock-surfaces, 204 

 Igneous rocks, 54, 61, 156 



. 229, 243 

 Inclination of rocks, 105 



relative to curvature, 145 

 Indoor work, 209 



ratified igneous rocks, 159, 

 1 68 



Intrusive igneous rocks. 159, 160 

 Inversion of strata, 137, 151 



proved by fossils, 90 

 lolite, 230 

 Ireland, former abundant lakes of. 



197 

 Iron, as a colouring ingredient of 



rocks, 68, 69, 70 

 Iron-peroxide, streak of, 68 

 Iron -phosphate, blue colour of. 71 

 Iron, protosilicate of, as a colour- 

 ing ingredient in rocks, 70 

 Islay, cleaved rocks in, 154 

 Isoclinal folds, 151 



Joints, 161, 171, 194 



Jurassic rocks, overlap among, 119 



Kames (Eskers, Osar), 201 

 Kaolin, 231 



Killas, or slate of Cornwall, 189 

 Kincardineshire, volcanic rocks of . 



173 



King. Mr. Clarence, 49. 51 

 Klein's solution, 221 

 Kyanite, 178, 230 

 as a colouring ingredient of 

 rocks, 71 



