Excerpt from American Journal of Pharmacy, Vol. 13: Published by Authority of the Philadelphia of Pharmacy An electric spark, or any ignited body, a wire made ih candescent by a galvanic discharge, has an influence ana logons to platina sponge, of which the minutest particle is sufficient to cause ignition throughout an inflammable mix ture, however large. There is, in this respect, an analogy between the explosion of inflammable, gaseous mixtures, and those of gunpowder, and of other fulminating powders, of which some, as it is well known, detonate by percussion or friction, or any cause adequate to derange the iequili.' brium oftheir particles. In the cases last mentioned, the change produced is the same, whatever may be the exciting cause, and the minutest portion of the congeries being made to undergo the change, is ofitself competent to produce a like result as respects the whole. 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.