<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/MS/242/39" 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 Friedrich Heinrich Alexander von Humboldt to Thomas Young, dated at Paris </dc:title>
  <dc:description>Letter of introduction on behalf of Claude Pouillet, recommended highly as a physicist by von Humboldt and [Jean Francois Dominique] Arago for his experiments on water vapour [which led Pouillet to be the first to propose the mathematical formulation of the greenhouse effect]. 
Some draft notes in Young's hand at the back.</dc:description>
  <dc:date>27 July 1823</dc:date>
</rdf:Description>