Letter from John Birkett to Richard Butcher Manuscript letter from John Birkett to Richard Butcher thanking him for 'your kind present'. The letter discusses Butcher's work on excision, Birkett fearing that 'you have been induced to rely too implicitly upon the report of the successful issues of cases of excision'. He offers to follow up on the London case and send Butcher 'the results of my own examination'. 19 February 1855