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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/6/362" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Letter, from Augustus De Morgan to Sir John Herschel, dated at 91 Adelaide Road</dc:title>
  <dc:description>Autograph letter signed by sender. Sends an extract from J. J. Lalande's article on planets from the Encyclopedie methodique. Sends two of his own theorems.</dc:description>
  <dc:date>20 March 1863</dc:date>
</rdf:Description>