TY - JOUR T1 - A Letter from Mr. John Martyn, F.R.S. Prof. Botan. Cantab. to John Machin, Esq; Secr. R. S. and Prof. Astron. Gresham. concerning an Aurora Australis, Seen March 18. 1738-9. at Chelsea, Near London JF - Philosophical Transactions (1683-1775) VL - 41 SP - 840 EP - 842 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1739.0154 M3 - doi:10.1098/rstl.1739.0154 AU - Martyn, J. ER -