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Ranges of a particles from Thorium and Actinium. 647 calculation of the diffusion coefficient. Hahn and Sackur* obtained the same value by following the change of activity directly by means of an electrometer. Similarly the period of transformation, 54 seconds or A.= 1"29 x 10 -2 see. -1 found by Bronson t, was adopted t~or thorium emanation. My thanks are due to Professor Rutherford for his help and interest in these experiments. Physical Laboratory, The Victoria University, Manchester LXII.doi:10.1080/14786441008637370 fatcat:xp7c6y2zv5adhftxw3zxnvtnhi