Letter from Koninklijk Nederlandsch, Meteorollogisch Instituut, Utrecht, collected by the [Royal Society Krakatoa Committee] Spanning 22 February-5 March 1884. Reports passing through large fields of pumice stone and observing a brilliant golden yellow sky. Observes a green coloured sky, westwards, following sunset. Specific coordinates mentioned: Lat 6.16 Long 105.27 Lat 10.3 Long 99.53 Lat 18.54 Long 82.17 18 June 1884