As to Riddle XXII, I had a vague memory of some sort of leather curing process? A quick google provides this, starting a bit down the page with "instigated an investigation into Anglo-Saxon leather-working technology" and stopping when he starts going on about Freud (unless you like that sort of thing, obviously). But this is very, very much Not My Period, and any vague knowledge I have about it comes only from a fondness for riddles, so I have no idea at all how reliable or accurate either Wilcox or his interpretion is.
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As to Riddle XXII, I had a vague memory of some sort of leather curing process? A quick google provides this, starting a bit down the page with "instigated an investigation into Anglo-Saxon leather-working technology" and stopping when he starts going on about Freud (unless you like that sort of thing, obviously). But this is very, very much Not My Period, and any vague knowledge I have about it comes only from a fondness for riddles, so I have no idea at all how reliable or accurate either Wilcox or his interpretion is.