Excerpt from The Chemistry of the Radio-Elements, Vol. 2: The Radio-Elements and the Periodic Law This important discovery is shared by several investigators, notably A. F leck, A. S. Russell, and K. F ajans. It dates from the commencement of the present year, 1913 but new as it is, it has not been found advisable to deal with it at all in historical order of sequence. Though it must not be forgotten that all the necessary main advances in our knowledge of the chemistry of the radioactive elements, and of the sequence of radioactive changes, were made prior to the recognition of the underlying generalisation, and were not in any sense made to suit the needs of this generalisation (compare Annual Reports of the Progress of Chemistry, Radioactivity, At the same time it has been pos sible to predict from the generalisation many new details, and these have been almost immediately and conclusively established by experiment. 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.