Copy of a circular from Cromwell Mortimer, London, to Bernard Forest de Belidor A Collection of letter writ by the Secretaries of the Royal Society and secondly Dr Cromwell Mortimer's Letters ' Dr Mortimer to Mr Belidor, giving thanks for his last communications : that he has desired Dr Desaguliers to transmit from Holland a french account of Gerves'sEngine : if not he will do it himself. ' 14 May 1731