pt.1. On the volcanic phenomena of the eruption, and on the nature and distribution of the ejected materials, by J.W. Judd.--pt.2. On the air waves and sounds caused by the eruption of Krakatoa in August, 1883. Prep. by the Meteorological Office and presented by R. Strachey.--pt.3. On the seismic sea waves caused by the eruption of Krakatoa, August 26th and 27th, 1883, by W.J.L. Wharton ... in completion of the unfinished notes of F.J. Evans.--pt.4. On the unusual optical phenomena of the atmosphere, 1883-6, including twilight effects, coronal appearances, sky haze, coloured suns, moons, &c., by F.A. Rollo Russell and E. Douglas Archibald.--pt.5. Report on the magnetical and electrical phenomena accompanying the Krakatoa explosion. Prep. at the request of the Kew Committee, by G.M. Whipple