One delightful but painful side effect of working on this talk has been that I am now absolutely consumed with the desire to spend some months sitting in rare book libraries with amazing tomes before me: I do have a sabbatical coming up, not next year but the following one (i.e. 2016-17), with the only problem being that I have two competing projects that I am equally excited about, The ten-week Clarissa and the new one for which I have just now created a folder on the hard drive titled "Ancients and moderns"!
So, Paddy Bullard, “What Swift did in libraries,” in Jonathan Swift and the Eighteenth-Century Book, ed. Bullard and James McLaverty (Cambridge: Cambridge University Press, 2013), 65-84 (the quotation is on 72):
[I]t is clear that Swift was an unusually active reader. This activity often involved a kind of conversation with the text written upon the printed page. The tone of that conversation was often indignant or otherwise aggressive--the anti-Scottish invective of his notes on Clarendon ('Cursed hellish Scots!'--'Greedy Scotch rebellious dogs'--'Diabolical Scots forever', etc.) is not untypically virulent.Also: "The regularity of Swift's anti-monarchical marginalia across several volumes gives it a ritual quality, as though he were leafing through his books looking for opportunities to perform it. . . . It seems that Swift found in the pages of his personal library a textual site just secure enough to bear anti-monarchical inscriptions that were too dangerous for him to make in any other kind of papers, either published or private" (74).