The Boyle Letters Letters to and from Robert Boyle. These are artifical compilations created by their more recent custodians. Volumes 1-5 of the Boyle Letters are arranged in an approximately alphabetical sequence, while volume 6 is more miscellaneous and volume 7 comprises a separate chronological series of letters assembled by Henry Miles in the eighteenth century. All are now bound up in green buckram guardbooks of twentieth century date. 17th century