Employment for the microscope. [electronic resource] : In two parts. I. An examination of salts and saline substances, their amazing configurations and crystals, as formed under the eye of the observer: with plain directions how to prepare such substances, and preserve them in constant readiness for inspection; whereby the curious may always be furnished with numberless objects higherto little known. Also occasional considerations on gems, poisons, the vegetation of metals, the resusciation of plants, the formation of amber, corals, and many other subjects. II. An account of various animalcules never before described, and of many other microscopical discoveries: with observations and remarks. Likewise a description of the microscope used in these experiments, and of a new micrometer serving to shew the size of magnified objects. Together with instructions for printing off any medal or coin. Illustrated with seventeen copper plates. By Henry Baker, fellow of the Royal Society, and member of the Society of Antiquaries of London.