There exists everywhere a medium in things, determined by equilibrium.

There exists everywhere a medium in things, determined by equilibrium.

I saw in a dream a table where all the elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper.

No law of nature, however general, has been established all at once; its recognition has always been preceded by many presentiments.

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.

When the elements are arranged in vertical columns according to increasing atomic weight, so that the horizontal lines contain analogous elements again according to increasing atomic weight, an arrangement results from which several general conclusions may be drawn.