Excerpt from Micrographia: Containing Practical Essays on Reflecting, Solar, Oxy-Hydrogen Gas Microscopes; Micrometers; Eye-Pieces, &C. &C The chapter on Monochromatic Illumination con tains many curious particulars: that on Solar Engi scopes may be said to be written on a new species of instrument, or one at least not as yet introduced into use, but which may be expected one day to become highly popular with the more refined and fastidious admirers of the wonders displayed by Solar Micro scopes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.