Tis much better to do a little with certainty & leave the rest for others that come after than to explain all things by conjecture without making sure of any thing.
If the experiments which I urge be defective, it cannot be difficult to show the defects; but if valid, then by proving the theory, they must render all objections invalid.
I keep the subject of my inquiry constantly before me, and wait till the first dawning opens gradually, by little and little, into a full and clear light.
