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Excerpt from The Progress of Physics, During 33 Years (1875-1908) Observational Sciences. Judgment affected by Scale. Terrestrial Magnetism. Existence of Potential. Separation of internal and external Causes. Diurnal Variation. Magnetic Storms. Their causes. Solar Inuence. Theories of Secular Variation. Atmospheric Electricity. Negative Charge of Earth. Ionization of Air. Origin of Atmospheric Electricity. Electric Charge of Rain. Ebert's Theory. Cause of Thunderstorms. The Age of the Earth. Rigidity of Earth. Displace ment of Axis. Gravitation. Identity of Molecules of the same kind. 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.