Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página 32
... increasing population ) that the available portion should be rendered as fertile as it is possible for skill and industry to accomplish . In the present chapter we intend to direct atten- tion , first , to the geological character of ...
... increasing population ) that the available portion should be rendered as fertile as it is possible for skill and industry to accomplish . In the present chapter we intend to direct atten- tion , first , to the geological character of ...
Página 42
... increasing the mass , but absorbing and fixing the ammonia which escapes during fermentation . And in many cases it has been charred by combustion in smothered heaps , and the dry ashes applied with excellent effect to soils deficient ...
... increasing the mass , but absorbing and fixing the ammonia which escapes during fermentation . And in many cases it has been charred by combustion in smothered heaps , and the dry ashes applied with excellent effect to soils deficient ...
Página 50
... increasing demand . In selling or in purchasing estates , this twofold value should always be held in view ; and no factor or estate agent can do justice to his client who is incapable of estimating , or of pro- curing reliable ...
... increasing demand . In selling or in purchasing estates , this twofold value should always be held in view ; and no factor or estate agent can do justice to his client who is incapable of estimating , or of pro- curing reliable ...
Página 52
... increased by the skilful introduction of wood and water . It is astonishing how much can be done by a little judicious planting and enclosure . A few clumps to break the monotony of a moor , a trail of ivy over a bald brow of rock , a ...
... increased by the skilful introduction of wood and water . It is astonishing how much can be done by a little judicious planting and enclosure . A few clumps to break the monotony of a moor , a trail of ivy over a bald brow of rock , a ...
Página 53
... increased . II . MINERAL OR GEOLOGICAL VALUE . In addition to its surface or agricultural value , every estate has a mineral worth depending on the nature of the rocky substances that lie below . In some instances this value may arise ...
... increased . II . MINERAL OR GEOLOGICAL VALUE . In addition to its surface or agricultural value , every estate has a mineral worth depending on the nature of the rocky substances that lie below . In some instances this value may arise ...
Outras edições - Ver tudo
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Palavras e frases frequentes
abundance admixture agricultural alumina amount antimony arsenic arts and manufactures basalts beds bismuth bituminous blocks Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay clayey coal colour compact composition consists containing copper crust crystalline crystals deposits districts durable earth employed engineer felspar fire-clays formations geologist Geology gold granites gravels Greensand greenstones grits gypsum hard heat hence hornblende igneous ingredients iron ironstones known largely lignites lime limestones lustre magnesia manganese manures marbles marls masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat phosphate pigments polish porphyries potash preparation purposes pyrites quarries quartz require rocks saline salts sand sandstones schists serpentines shales silica Silurian silver soda sodium soft soils specific gravity stones strata stratified structure subsoils substances sulphate sulphide sulphuric acid surface tellurium tertiary texture thickness tion tons usually varieties various vary veins volcanic yield zinc