All precious stones are transparent, or at least translucent, from which it may be concluded that the matter of which each consists is homogeneous. Now this homogeneity could never have been attained by the mixture of their elements in the solid state, however finely these may have been pulverized, and hence they must have been [...]
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The word “electricity” is derived from the Greek “elektron,” which was the name for amber, a mineralised resin of extinct pine-trees. It was well-known to the people of pre-historic times; later to the early Egyptians, and, at a still later date, we have recorded how Thales -the Greek philosopher, who lived about the close of [...] |
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