The sentence Thompson indexed exists verbatim on our shelf — one chapter from where the wiring landed. His row resolves, in our translation’s numbering, to the Ragnarok chapter [The Prose Edda (The Younger Edda), THE FOOLING OF GYLFE. XVI]; the swans live earlier, beside the ash: “Two birds are fed in Urd’s fountain” — “they are called swans, and they are the parents of the race of swans” [The Prose Edda (The Younger Edda), THE FOOLING OF GYLFE. VII]. The context does quiet aetiological work. The norns “every day take water from the fountain” to sprinkle the ash Yggdrasil, and “This water is so holy” that all things put into it “become as white as the film of an egg-shell” [ibid.]. The swans’ whiteness is never explained aloud; the well’s whitening power stands beside the birds and lets the reader close the circuit. Boberg is Thompson’s only other authority for the address. A one-line numbering fix in the citation wiring — Snorri’s chapters against Anderson’s divisions — would make this one of the shelf’s most exactly verified pages: the whole motif is a single served sentence, and it is letter-perfect.