Third edition. Sometimes viewed as the 5th edition because of the three printings of the first edition. See Swift's "Bibliographic Comments" for further details.
Edition apparently not stated. This is a duodecimo, i.e. twelvemo, edition, i.e. about 5" x 7.5", and this distinguishes it from all other editions of 1726-1727. One source says that this is ab abridged edition, which is consistent with the page count and the reduced size. {{OCLC|186519540}} records an abridged edition "Printed for J. Stone, and R. King" with the same page count, so that edition is probably the same as this one.