Letter, from Martin Lister to Henry Oldenburg, dated at York Signed autograph States that he will send on further observations of spiders's 'action of the darting of thread'; concerning the acid liquor of pismires (type of ant); observations of trying to obtain sap from sycamore ( 'bleeding of sycamore') Read to the Royal Society on 9 February 1670 Transcription in 'The correspondence of Henry Oldenburg', ed and trans by A Rupert Hall & Marie Boas Hall, vol 7, p 415 Printed in 'Philosophical Transactions', vol 5, no 68, p 2067 25 January 1670