Chemistry is not yet a science. We are very far from the knowledge of first principles. We should avoid every thing that has the pretensions of a full system. The whole of chemical science should, as yet, be analytical, like Newton's Optics, in the form of a general law, at the very end of our induction, as the reward of our labour.

Lectures on the Elements of Chemistry (Volume 1) (p. 547), Mundell & Son. Edinburgh, Scotland. 1803