TY - JOUR T1 - On Radiant Matter Spectroscopy: Note on the Earth Y$\alpha $ JF - Proceedings of the Royal Society of London (1854-1905) VL - 40 SP - 236 EP - 237 PY - 1886/01/01/ UR - http://dx.doi.org/10.1098/rspl.1886.0026 M3 - doi:10.1098/rspl.1886.0026 AU - Crookes, W. ER -