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

Why do they [Americans] quarrel, why do they hate Negroes, Indians, even Germans, why do they not have science and poetry commensurate with themselves, why are there so many frauds and so much nonsense?

No one nor anything can silence me.

The elements which are the most widely diffused have small atomic weights.

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

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

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.