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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HF/1/3/2/23/5" 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 Howard Walter Florey to P Hartley, National Institute for Medical Research, Hampstead</dc:title>
  <dc:description>Sends details of formula for medium he is using for producing penicillin - believes Hartley is using steep liquor instead of yeast extract - can send yeast extract if needed - suggests addition of B prodigiosus as test organism - incubate large quantities of the fluid  - small samples give deceptive results.</dc:description>
  <dc:date>19 November 1941</dc:date>
</rdf:Description>