"Then" for "than."

At the end of Selden's *Titles of Honour* (edit. 1631), after the list of "Faults escapled in print," occur the words, "may with no less difficulty be amended *then* observed?" Was the word *then* commonly used in the sense of *than*; or is it a misprint? [Dr Latham, in *English Language*, p. 377. (3d ed.), observes. "As to the word *than*, the conjunction of comparison, it is a variety of *then*; the notions of *order*, *sequence*, and *comparison*, being allied. *This is good; then* (or *next in order*) *that is good*, is an expression sufficiently similar to *this is better than that* to ha…