William Shakespeare, Nick De Somogyi (2001). “Hamlet: The Tragedie of Hamlet, Prince of Denmarke : the First Folio of 1623 and a Parallel Modern Edition”, p.106, Nick Hern Books
'Hansard' 17 March 1845, col. 1028. Bagehot, quoting Disraeli in 'The English Constitution' (1867) 'The House of Lords', elaborated on the theme with the words 'so much did the ideas of its "head" differ from the sensations of its "tail".'