Excerpt from In a Glass Darkly, Vol. 1 of 3 It is related in a series of letters to his friend Professor Van Loo of Leyden. The professor was not a physician, but a chemist, and a man who read history and metaphysics and medicine, and had, in his day, written a play. 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.