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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/RSL/3/10" 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 James Calder, Maryland, to Sir Joseph Banks </dc:title>
  <dc:description>Sends notes of observations made on a visit to Niagara in 1789; sees evidence that the cataract is gaining continuously upward; if it could be determined at what annual rate the rock is worn away, the age of the world could be known; it is said locally that the wear is half a rod (2 3/4 yards) a year.

With accompanying note by Charles Lyell, 31 January 1856, stating that this remarkable letter proves that early visitors to Niagara were struck by the retrogression of the Falls.</dc:description>
  <dc:date>10 January 1794</dc:date>
</rdf:Description>