Science, Том 14John Michels (Journalist) American Association for the Advancement of Science, 1889 |
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Стр. 229
... produced by chemical changes in carboniferous beds , equally large masses of solid carboniferous remains must still exist ; but of this there is absolutely no evidence while cases occur in Pennsylvania where oil is obtained from the ...
... produced by chemical changes in carboniferous beds , equally large masses of solid carboniferous remains must still exist ; but of this there is absolutely no evidence while cases occur in Pennsylvania where oil is obtained from the ...
Стр. 260
... produced by putrefactive decomposition ; that is , by the action of micro - organisms . The alkaloids proper are produced by changes going on within the living organism of plants . But they have this in common , that they are both produced ...
... produced by putrefactive decomposition ; that is , by the action of micro - organisms . The alkaloids proper are produced by changes going on within the living organism of plants . But they have this in common , that they are both produced ...
Стр. 349
... produced only in these exposed wires . If the wires are conducted to another analogously constructed plate , which may be placed at any distance from the first one , then the electric current will also here be produced only at the parts ...
... produced only in these exposed wires . If the wires are conducted to another analogously constructed plate , which may be placed at any distance from the first one , then the electric current will also here be produced only at the parts ...
Содержание
A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES | 35 |
Subscriptions United States and Canada | 60 |
Communications will be welcomed from any quarter Rejected manuscripts will | 236 |
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