M. Tullii Ciceronis, 1555 {Width: 2-3/4"; Height: 4-1/2"; Thickness: 5/8"}
This is Volume 4 of the set making up Cicero's discussion on Rhetoric. It is very similar to the previously exhibited volume. The title page includes the phrase: Eiusdem DE INVENTIONE. As with Volume 2, the covers are missing from this volume.