<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/23/363" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Copy letter, from Sir John Herschel to Augustus De Morgan, dated at Collingwood</dc:title>
  <dc:description>Copy of a letter. Comments on family health; asks Augustus De Morgan if he has read James Challis on the topics of the ether and of zodiacal light.</dc:description>
  <dc:date>26 February 1863</dc:date>
</rdf:Description>