<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/6/346" 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 41 Chalcot Villas NW</dc:title>
  <dc:description>Autograph letter signed by sender. Has not heard from him for a long time. Did he receive his red and black logarithms? John Frederick William Herschel's son Alexander has sent him a mathematical problem. George Bishop has died and the observatory and instruments are to be sold. Sends two riddles. Sees that John Frederick William Herschel has proved that the sun is liquid fire.</dc:description>
  <dc:date>1 July 1861</dc:date>
</rdf:Description>