Nature, Volume 72Sir Norman Lockyer Macmillan Journals Limited, 1905 |
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Página 309
... light stimulus . Now it has been shown by Stoletow , Hallwachs , and Elster and Geitel that there is an intimate connection between photo - electric activity and the absorption of light by the substance , and , indeed , that the ...
... light stimulus . Now it has been shown by Stoletow , Hallwachs , and Elster and Geitel that there is an intimate connection between photo - electric activity and the absorption of light by the substance , and , indeed , that the ...
Página 323
... light , but the question of how the light stimulates the leaf to perform the curvatures and torsions which bring it into the " light position " is a problem which hitherto has hardly been attacked . The first question to be solved is ...
... light , but the question of how the light stimulates the leaf to perform the curvatures and torsions which bring it into the " light position " is a problem which hitherto has hardly been attacked . The first question to be solved is ...
Página 324
... light . After three or four days the D leaves showed no signs of taking up the light - position , while the two L leaves showed well marked curvature towards that position . The experiment is of importance , since it shows that ...
... light . After three or four days the D leaves showed no signs of taking up the light - position , while the two L leaves showed well marked curvature towards that position . The experiment is of importance , since it shows that ...
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