xiv. THE ELEMENTS OF ECONOMIC GEOLOGY 
FIG, 
4I. The Bilbao anticline . . 
42. Lake Superior iron ores 3 3 z 
13. Lake Superior ores bounded by an impermeable surface 
"4. ton ore at Gellivaara . . . 3 . 
. Magnetite of the Adirondacks replacing felspar and quartz 
<u. The ore-sheet of Kirunavaara 
47. Various processes of bauxite formation. 
8. Formation of mica in gneiss . 
49. Chlogopite lode at Loughborough . 
50. China-clay mass in Cornwall - » 
51. China-clay passing into quartz-porphyry 
52. China-clay produced by acids from brown coal 
53. Phosphate formation . . . . 
54. Section across the German potash fields showing the relations of 
the four types of occurrence . . . 
55. Salt dome at Baicoi oilfield . . . ' 
56. Section across the German potash field north of the Harz Moun. 
tains . . * 6 
57. The water table in an island . . 
58. Underground water level and piezometers 
59. Circulation of water in a porous bed ' 
60. The ascent of water by rock pressure, Kynuna 
61. Changes in the East Anglian estuaries ; 
62. Shoaling of the Ceara breakwater, Brazil 
53. Comparative oilfield sections « 2 
PAGE 
137 
139 
130 
40 
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3 
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3 
159 
yo 
72 
L172 
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208 
213 
215 
224 
226 
231 
233 
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247 
282