Excerpt from Transactions and Proceedings and Report of the Royal Society of South Australia (Incorporated), 1909, Vol. 33 It would seem almost better to replace the name of ah sorption coefficient, as it is usually employed, by that of transmission coefficient, reserving the former as a measure of effects which, as has been explained, can probably be Obtained only from a study of very thin screens. If the interpretation of the foregoing experiments be correct it seems that the B particle in traversing a thick screen may suffer many collisions and deflections. Now it has been shown by Allen (phys Review, Aug, 1906) that the secondary or reflected B radiation consists of electrons moving on the whole with a somewhat slower speed than the original radiation. 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.