TY - JOUR T1 - The Parent of Actinium JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 94 IS - 662 SP - 384 EP - 404 PY - 1918/06/01/ UR - http://dx.doi.org/10.1098/rspa.1918.0025 M3 - doi:10.1098/rspa.1918.0025 AU - Soddy, F. AU - Cranston, J. ER -