The present work was undertaken with a view to testing the scattering functions as given by classical and quantum theories, and studying the influence of the variations referred to above. This seemed desirable in making an attempt to reconcile the conflicting results of various experimenters, and in order to obtain more information regarding the conditions necessary for the observation of the modification by scattering. (See papers on the 3- phenomenon). In particular in this laboratory it has many times been found that when the radiator has been very thin, the difference between primary and scattered radiation has entirely disappeared, also the difference between the radiations scattered in different directions has under certain conditions vanished or become evident only by a discontinuity. The conditions most favourable for these results agreeing with classical theory, seemed to be (1) a thin scatterer, (2) a soft radiation and (3) possibly feeble intensity.