TY - JOUR T1 - Part of a Letter from Mr Gray, concerning an Unusual Parhelion and Halo JF - Philosophical Transactions (1683-1775) VL - 22 SP - 535 EP - 535 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1700.0021 M3 - doi:10.1098/rstl.1700.0021 AU - Gray, M. ER -