The description and use of an opake solar microscope. In which all opake bodies, whether of Animal, Vegetable, Fossil, or Marine Production, are shewn in the greatest perfection, in all their native Beauties, of Lights, Shades, Prominences, Cavities; and all Variety of different Hues, Tints, and Colours, heightened by Reflection of Solar Rays condensed upon them, to an amazing Degree: at the same time all transparent objects are also shewn in a new light, and in a manner peculiar to this instrument. Illustrated by a copper-plate section of the microscope in its full length. By B. Martin [electronic resource].