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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/4/254" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Draft notes towards a letter, from Sir John Herschel to David Brewster</dc:title>
  <dc:description>Memoranda of letter, in Herschel's hand. Notes on Brewster's letter from 11 February 1820.  Presented as extracts and answers, marked A. Discusses the theories on deviations of tints, and optics in crystals. Relates to paper published for the Cambridge Philosophical Society.</dc:description>
  <dc:date>19 April 1820</dc:date>
</rdf:Description>