The identification of the 1611 edition of Titus Andronicus as an octavo rather than, as had previously been assumed, as a quarto is confirmed by chain line and watermark evidence, as well as by the dimensions of the leaves. The Houghton Library copy of this text (STC 22330) has vertical chain lines and watermarks in the upper inner margin, just as one would expect to find in an octavo. So too the Folger Shakespeare Library copy (see catalogue description at http://hamnet.folger.edu/cgi-bin/Pwebrecon.cgi?BBID=163950 ). The leaf dimensions of the Houghton copy are 12 cm. x 18 cm.; the result is a longer, more traditional octavo leaf rather than the more distinctively squarish shape one finds in quartos, whose chain lines are almost always oriented horizontally and whose watermarks are usually found in the middle of the gutter.
