Letter from C.G Thorp, 182 St George's Terrace, Perth [Western Australia], to The Secretary, The Royal Society, London Interested in ascertaining the source of Australian obsidianites, which he is satisfied are of terrestrial volcanic origin. Requests a copy of "The Eruption of Krakatoa and Subsequent Phenomena", published among the Transactions of the Royal Society. Seeks any additional information on the lavas of the volcanos of the East Indian Island belt. 3 June 1910