 Light, where it exists, can exert an action, and, in certain circumstances, does exert one sufficient to cause changes in material bodies. Suppose, then, such an action could be exerted on the paper; and suppose the paper could be visibly changed by it....  The Home Book of Pleasure and Instruction - Página 371editado por - 1867 - 567 páginasVista completa - Acerca de este libro
 | Robert Kemp Philp - 1864 - 1126 páginas
...certain circumstances does exert one, sufficient to cause changes in material bodies. Suppose, then, such an action could be exerted on the paper, and suppose...strength or weakness of the light which had acted there. Bearing in mind the experiments of the alchemists in the sixteenth century, which resulted in the discovery... | |
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