The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة xiii
... Coal Mining Chimneys Engines · Wind and Water Power Electricity Petroleum Gasoline · • Silicon 183 183 184 185 185 186 187 187 187 188 188 190 190 191 191 192 193 194 195 196 196 197 • 198 199 199 Mechanical Slaves Man versus Machine ...
... Coal Mining Chimneys Engines · Wind and Water Power Electricity Petroleum Gasoline · • Silicon 183 183 184 185 185 186 187 187 187 188 188 190 190 191 191 192 193 194 195 196 196 197 • 198 199 199 Mechanical Slaves Man versus Machine ...
الصفحة 25
... coal into anthracite may be mentioned also . In as much as the soils are either formed in place by the decay of rocks , or else their particles have been moved to new locations by ice , water , or wind , we may classify them as ...
... coal into anthracite may be mentioned also . In as much as the soils are either formed in place by the decay of rocks , or else their particles have been moved to new locations by ice , water , or wind , we may classify them as ...
الصفحة 26
... coal accumulation Mississippian period : rise of marine fishes Devonian period : first known amphibians Silurian period : first known land floras Ordovician period : first known fresh water fishes Cambrian period : first abundance of ...
... coal accumulation Mississippian period : rise of marine fishes Devonian period : first known amphibians Silurian period : first known land floras Ordovician period : first known fresh water fishes Cambrian period : first abundance of ...
الصفحة 56
... coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their lungs are coated , and they are made susceptible to the attacks of germ diseases if 56 THE PHYSICAL BASIS OF SOCIETY.
... coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their lungs are coated , and they are made susceptible to the attacks of germ diseases if 56 THE PHYSICAL BASIS OF SOCIETY.
الصفحة 58
... or crevices in the rocks but have accepted the chimneys as substitutes . Wrens and martins appreciate the houses built by man . The owl will lodge in the church 58 THE PHYSICAL BASIS OF SOCIETY Coal Mining Chimneys Dangers of Changes.
... or crevices in the rocks but have accepted the chimneys as substitutes . Wrens and martins appreciate the houses built by man . The owl will lodge in the church 58 THE PHYSICAL BASIS OF SOCIETY Coal Mining Chimneys Dangers of Changes.
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acres Africa alloy America appears areas Asia atoms average bacteria birds black bass body carbon carbon dioxide cattle cause cells Cenozoic cent century changes chemical chlorophyll climate coal common compounds crops cultivated culture death rate destroy disease distribution domestic animals early earth eaten eggs elements enemies Europe evidence fact fish forms germ germ cells hawk heat horse human hydrogen Ibid important increase Indian insects iron killed known land later light live man's metals mice migration miles moth native nature neolithic nitrogen ocean organisms oxygen Pará rubber tree parasites plants and animals population pounds produce protoplasm R. S. LULL race regions rodents season seeds seems sharp-shinned hawk sheep soil South South America species square mile substances sugar supply surface survive tarpan temperature thousand tion to-day trees tropics types United wild