TY - JOUR T1 - Radio-Activity and the Electron Theory JF - Proceedings of the Royal Society of London (1854-1905) VL - 69 SP - 413 EP - 422 PY - 1901/01/01/ UR - http://dx.doi.org/10.1098/rspl.1901.0125 M3 - doi:10.1098/rspl.1901.0125 AU - Crookes, W. ER -