In his article "Parasitism and Pale Fire's Camouflage," James Ramey links Lane's comment about "the crooked made straight" to Nabokov's use of what Ramey calls "double italics"--that is, places in PF where something should be in italics but is not. Ramey believes these "misprints" are intentional, and lead us to, among other things, the crown jewels ("hiding place" is one of those index headings that should be in italics but isn't). To bolster his point, he refers us to Humbert's recollection that "I once read a French detective tale where the clues were actually in italics." As an aside, I should add that Ramey does some great work using Webster's 2nd, wherein, for one thing, "Boswellian" is directly adjacent to "bot."

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