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Excerpt from On the Construction and Use of the MicroscopeThese motives have induced me to give the book a more popular form, as well as to make it as practically useful as possible. The theoretical portion, therefore, only contains the principles of Dioptrics and Catoptrics, without which the construction of the microscope could not be understood; and the section treating of these subjects is further limited to the explanation of the apparatus used at the present time, although I have appended, for the sake' of complete ness, an historical Sketch of the manner in which each part of the microscope is constructed and arranged. The instruc tions for the use of the microscope are given with the great est fulness, as constituting the most important section of the work and as the dioptric compound microscope is the one most used at present, I have limited my observations to that alone.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.