The groups into which the collection has been arranged are:
I, items 1 to 5, Biographical
II, items 6 and 7, Bibliographies
III, items 8 to 13, Articles, addresses, essays: drafts, proofs and correspondence
IV, items 14 to 20, Manuscript drafts and synopses
V, items 21 to 26, Drafts and notes for an unpublished collection of 'Maxims'
VI, items 27 to 199, Working papers and notes. Some of these notes were probably assembled for Science since 1500; but most are related to Pledge's projected synthesis of knowledge. His wide range of reading and thinking produced copious notes, which he re-arranged and reallocated according to an increasingly elaborate system. The many plans he devised show the scale of his intention and the problems he encountered.
VII. Correspondence: 32 letters