Letter, from Martin Lister to Henry Oldenburg, dated at York Signed autograph Observations of mushrooms found at Marton woods, Craven (western Ribblesdale Yorkshire), which produced milky juices Read to the Royal Society on 20 November 1672 Transcription in 'The correspondence of Henry Oldenburg', ed and trans by A Rupert Hall & Marie Boas Hall, vol 9, p 324 Printed in 'Philosophical Transactions', vol 7, no 89, p 5116 15 November 1672