Or I. The nature, uses, and magnifying powers of the best kinds of microscopes described, calculated, and explained: For the instruction of such, particularly, as desire to search into the wonders of the minute creation, tho' they are not acquainted with optics. Together with full directions how to prepare, apply, examine, and preserve all sorts of objects, and proper cautions to be observed in viewing them. II. An account of what surprizing discoveries have been already made by the microscope: with useful reflections on them. And also a great variety of new experiments and observations, pointing out many uncommon subjects for the examination of the curious. By Henry Baker, Fellow of the Royal Society, and member of the Social of Antiquaries, in London. Illustrated with copper plates. The fourth edition: with an additional plate of the solar microscope, an some farther accouns of the polype