The Encyclopedia Americana: A Library of Universal Knowledge ...Encyclopedia Americana Corporation, 1924 |
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Stran 244
... plants , but they do not seem to be essential to plant life . The Air.- The growth of plants is greatly influenced by temperature and rainfall , both of which are controlled by the atmosphere . The nitrogen of the air is one of the ...
... plants , but they do not seem to be essential to plant life . The Air.- The growth of plants is greatly influenced by temperature and rainfall , both of which are controlled by the atmosphere . The nitrogen of the air is one of the ...
Stran 246
... plants and synthesized into organic compounds which are then used by animals and returned to the soil in manure or the dead body . Here also some of the nitrogen is returned to the soil by de- caying plants , but the main cycle is soil - ...
... plants and synthesized into organic compounds which are then used by animals and returned to the soil in manure or the dead body . Here also some of the nitrogen is returned to the soil by de- caying plants , but the main cycle is soil - ...
Stran 405
... plants . Distribution.- Alkaloids are widely distrib- uted throughout the plant kingdom ; many plants contain them , and some plants contain a large number ; opium , Papaver somniferum , for in- stance , contains a dozen or more ...
... plants . Distribution.- Alkaloids are widely distrib- uted throughout the plant kingdom ; many plants contain them , and some plants contain a large number ; opium , Papaver somniferum , for in- stance , contains a dozen or more ...
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