|Alternative reference number||LBO/15/246|
|Title||Copy letter from Antoni van Leeuwenhoek to the Royal Society|
|Date||21 April 1722|
|Description||Written at Delph|
' Comfirming some of hi former Observations with an Account of the Iron Cross of a Steeple acquiring a magnetick quality . '
Translated by Dr Jurin
Read at the Royal Society 3 May 1722