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Certain characteristic properties of elements can be foretold from their atomic weights.

We could live at the present day without a Plato, but a double number of Newtons is required to discover the secrets of nature, and to bring life into harmony with the laws of nature.

There is nothing in this world that I fear to say.

The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.

We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75.