London: printed for Longman, Rees [et al.], 1818. First edition, first issue, of the first revision of Johnson's Dictionary, 5 volumes, 4to, engraved portrait after Reynolds, text in double column; full contemporary tree calf rebacked, old spines laid down, new red and green morocco labels; early owners' signatures and annotations on endpapers; a good, firm, useable set, with the half-titles. The first (5 volume) issue is far scarcer than the 4-volume issue of the same year. In it, volume 5, beginning with the letter T, contains the addition of a drop title at the top of leaf B1. B1 here corresponds to 6L3 in the 4-volume issue. In the 4-volume issue the pagination is continuous through the end of the fourth volume, but is paginated separately. Leaf 6L3 is signed "Vol. IV 6L3 - Vol. V. B." On the title-pp. of the 5-volume version is the statement "In Five Volumes," as opposed to "In Four Volumes" in the 4-volume issue. "Todd made some additions to Johnson's grammar and history…