Jane Marcet - Conversations on chemistry (1805)

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MRS. B:...There is... a beautiful green salt too curious to be omitted; it is produced by the combination of cobalt with muriatic acid, which has the singular property of forming what is called sympathetic ink. Characters written with this solution are invisible when cold, but when a gentle heat is applied, they assume a fine bluish green colour.

Jane Marcet

Nature also has her laboratory, which is the universe, and there she is incessantly employed in chemical operations.

Jane Marcet

CHEMISTRY, which is so closely connected with Natural Philosophy must be incomplete without some knowledge of the other; for, it is obvious that we can derive but a very imperfect idea of bodies from the study of the general laws by which they are governed, if we remain totally ignorant of their intimate nature.

Jane Marcet

I am not disposed to form a very favorable idea of Chemistry, nor do I expect to derive much entertainment from it. I prefer the sciences which exhibit nature on a grand scale, to those that are confined to the minutiae of petty details.

Jane Marcet