Knowing how contented, free, and joyful is life in the world of science, one fervently wishes that many would enter its portals.

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.

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.

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

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

The edifice of science not only requires material, but also a plan. Without the material, the plan alone is but a castle in the air-a mere possibility; whilst the material without a plan is but useless matter.

Knowing how contented, free, and joyful is life in the world of science, one fervently wishes that many would enter its portals.