In this Saltoun & Bolton website http://ndhm.org.ukhttp://ndhm.org.uk I happened upon the memorial inscriptions for Pencaitland also. Found George at E7.
"In memory of GEORGE KINGHORNE who was a faithful servant at Winton for nearly forty years and died on the 10th of May 1871 aged 72. This stone is erected by Lady Ruthven as a testimony of her regard for him. The gift of God is eternal life through Jesus Christ our Lord,"
http://www.scotlandspeople.gov.ukhttp://www.scotlandspeople.gov.uk gives his death certificate thus: GEORGE KINGHORN gardner Widower of JANET CRANSTON Died 10 May 1871 in the Parish of PencaitlandMale age 72 Father was George KINGHORN Forester deceased Mother was Betty KINGHORNM.Surname AITCHESON deceased. Cause of death Stoppage of the Bowels as cert by Duncan McGREGOR surgeon. Informant son George KINGHORN whose Edinburgh address I simply cannot decipher but am looking for possibles from you folks !