Amici constructed the first microscope with achromatic lenses and suggested water-immersion for improved achromatic lenses of the compound microscope. The 1820 publication of his paper indicates that it was "Approvata dal Sig. President Ruffini Avuta li 5. Marzo 1818."

A translation in French of the above appears in Ann. Chim. Phys. (Paris), 1820, 13, 384-410. Digital facsimile of the first journal publication in Italian (1820) from the Internet Archive at this link.