TY - JOUR T1 - Researches in Physical Astronomy [Continued] JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 121 SP - 283 EP - 298 PY - 1831/01/01/ UR - http://dx.doi.org/10.1098/rstl.1831.0017 M3 - doi:10.1098/rstl.1831.0017 AU - Lubbock, J. ER -