The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة 3
... cent , respectively . Oxygen Silicon Aluminum Iron Calcium Sodium Magnesium Potassium 47.02 per cent 28.06 8.16 4.64 3.50 2.63 2.62 2.32 98.95 per cent Some of the elements , like gold , are very passive and are seldom found in ...
... cent , respectively . Oxygen Silicon Aluminum Iron Calcium Sodium Magnesium Potassium 47.02 per cent 28.06 8.16 4.64 3.50 2.63 2.62 2.32 98.95 per cent Some of the elements , like gold , are very passive and are seldom found in ...
الصفحة 7
... cent ; phosphorus , 1.15 per cent ; sodium , 0.1 per cent ; calcium , 1.3 per cent ; magnesium , 0.001 per cent ; iron , 0.01 per cent and traces of silicon and fluorin . Plants are composed largely of oxygen , hydrogen and carbon . We ...
... cent ; phosphorus , 1.15 per cent ; sodium , 0.1 per cent ; calcium , 1.3 per cent ; magnesium , 0.001 per cent ; iron , 0.01 per cent and traces of silicon and fluorin . Plants are composed largely of oxygen , hydrogen and carbon . We ...
الصفحة 9
... cent by volume of the atmosphere and .01 per cent by weight of water . It is stated that over 100,000 compounds of carbon are now known . Some of these are very simple like carbonic acid ( CO2 ) ; others are so complex that a line would ...
... cent by volume of the atmosphere and .01 per cent by weight of water . It is stated that over 100,000 compounds of carbon are now known . Some of these are very simple like carbonic acid ( CO2 ) ; others are so complex that a line would ...
الصفحة 11
... cent but in coarse sand only 25 per cent . Evaporation takes a large amount of water from the soil , hence a covering of fine particles helps to retain the moisture . For one ton of clover hay some 1560 tons of water are used . Here ...
... cent but in coarse sand only 25 per cent . Evaporation takes a large amount of water from the soil , hence a covering of fine particles helps to retain the moisture . For one ton of clover hay some 1560 tons of water are used . Here ...
الصفحة 12
... cent , indicates man's recognition of the necessity of replacing these food elements . Plant life soon shows any decrease in needed supplies by spind- ling growth , poor color and little fruit . Different plants make different demands ...
... cent , indicates man's recognition of the necessity of replacing these food elements . Plant life soon shows any decrease in needed supplies by spind- ling growth , poor color and little fruit . Different plants make different demands ...
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