Can you find a single one that is not disproved by a fact?
Your Static laws are at the mercy of a thousand accidents; a fluid can overthrow a solid mountain and prove that the heaviest substances may be lifted by one that is imponderable.
"Your laws on Acoustics and Optics are defied by the sounds which you hear within yourselves in sleep, and by the light of an electric sun whose rays often overcome you.

You know no more how light makes itself seen within you, than you know the simple and natural process which changes it on the throats of tropic birds to rubies, sapphires, emeralds, and opals, or keeps it gray and brown on the breasts of the same birds under the cloudy skies of Europe, or whitens it here in the bosom of our polar Nature.

You know not how to decide whether color is a faculty with which all substances are endowed, or an effect produced by an effluence of light.

You admit the saltness of the sea without being able to prove that the water is salt at its greatest depth.

You recognize the existence of various substances which span what you think to be the void,--substances which are not tangible under any of the forms assumed by Matter, although they put themselves in harmony with Matter in spite of every obstacle.
"All this being so, you believe in the results of Chemistry, although that science still knows no way of gauging the changes produced by the flux and reflux of substances which come and go across your crystals and your instruments on the impalpable filaments of heat or light conducted and projected by the affinities of metal or vitrified flint.