TY - JOUR T1 - On the Figure of Equilibrium of a Planet of Heterogeneous Density JF - Proceedings of the Royal Society of London (1854-1905) VL - 36 SP - 158 EP - 166 PY - 1883/01/01/ UR - http://dx.doi.org/10.1098/rspl.1883.0090 M3 - doi:10.1098/rspl.1883.0090 AU - Darwin, G. ER -