The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 10
... destroyed . Before 1800 , Cavendish had discovered hydrogen and found that water was a combination of this with oxygen . A stream of discoveries followed and many new elements were revealed . In 1868 , Johannsen of Paris , using a ...
... destroyed . Before 1800 , Cavendish had discovered hydrogen and found that water was a combination of this with oxygen . A stream of discoveries followed and many new elements were revealed . In 1868 , Johannsen of Paris , using a ...
الصفحة 18
... The creeping sand dunes may destroy vegetation over wide areas or block the streams and thus injure man or , in other cases , help him by building up a barrier against the waves . An enormous amount of air- 18 THE PHYSICAL BASIS OF SOCIETY.
... The creeping sand dunes may destroy vegetation over wide areas or block the streams and thus injure man or , in other cases , help him by building up a barrier against the waves . An enormous amount of air- 18 THE PHYSICAL BASIS OF SOCIETY.
الصفحة 47
... man to abandon the territory or change his crops ; if the rains are light , the water may evaporate ere the crops are benefited ; if very heavy they may beat down and destroy the crops and wash the LIFE , ITS NATURE AND DISTRIBUTION 47.
... man to abandon the territory or change his crops ; if the rains are light , the water may evaporate ere the crops are benefited ; if very heavy they may beat down and destroy the crops and wash the LIFE , ITS NATURE AND DISTRIBUTION 47.
الصفحة 48
Carl Kelsey. may beat down and destroy the crops and wash the land . Fog may bring little precipitation but may be very helpful by preventing transpiration , while dew often prevents freez- ing . As we go from the equator to the poles we ...
Carl Kelsey. may beat down and destroy the crops and wash the land . Fog may bring little precipitation but may be very helpful by preventing transpiration , while dew often prevents freez- ing . As we go from the equator to the poles we ...
الصفحة 56
... destroy the vegetation for miles . Butte , Montana , once bore the reputa- tion of having neither lawns nor trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their ...
... destroy the vegetation for miles . Butte , Montana , once bore the reputa- tion of having neither lawns nor trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their ...
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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