Petty-Fitzmaurice, Henry William Edmund, 6th Marquess of Lansdowne and 7th Earl of Kerry Manuscript. Asks if Karl Pearson ever wrote anything on Sir William Petty's papers and gives his argument for Petty's authorship of the "Bills of Mortality" over Gaunt, regarding Petty's Down Survey Maps and date of first publication, on copies of Petty's maps of Ireland and information on provenance, and advertising the publication of his book containing a selection of Sir William Petty's unpublished papers and hoping Karl would read it and offer comment. 1925-1927