🔖 Excerpt from Œuvres Complètes de Christiaan Huygens, Vol. 13: Dioptrique, 1653; 1666; 1685-1692; Fascicule II; 1685-1692Nous possédons de cette Préface deux leçons assez différentes et un avant-projet. Nous suivrons ici la leçon la plus achevée, choisie aussi par De Volder et Fullenius; mais on trou vera l'avant-projet et l'autre leçon dans les Appendices I et Il à la présente Partie de la Dioptrique.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.