The Economic Aspect of Geology

ILLUSTRATIONS


FIGURE		PAGE
1.	Graphic representation of volume change in weathering of a Georgia granite	21
2.	Commercial (financial) control of the mineral resources of the world	64
3.	Political (territorial) control of the mineral resources of the world	64
4.	The fertilizer situation in the United States	100
5.	Diagram showing the chemical composition and heat efficiency of the several ranks of coal	122
6.	Origin and development of coal	123
7.	Chart showing the present tendency of the United States in respect to its unmined reserve of petroleum	134
8.	The annual output of the principal oil fields of the United States for the last twenty years	135
9.	Curve showing the usual decline in oil field production after the period of maximum output is reached	136
10.	Chart showing the relative values of the principal petroleum products manufactured in the United States from 1899 to 1914	138
11.	Alteration of Lake Superior iron formation to iron ore by the leaching of silica	168
12.	Representing in terms of weight the mineralogical changes in the katamorphism of serpentine rocks to iron ore, eastern Cuba	172
13.	Diagram showing gradation from syenite to bauxite in terms of volume	245

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