📕 Excerpt from Description des Machines Et Procédés pour Lesquels des Brevets d'Invention Ont Été Pris Sous le Régime de la Loi du 5 Juillet 1844, Vol. 86: 2e PartiePar l'introduction d'acide carbonique ou de bicarbonate de soude, le composé méthylène libre se sépare à l'état insoluble de sa solution aqueuse. Il se précipite sous forme de flocons blancs qui changent à l'air en couleur foncée.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.