However, Sigmund Feist (1909) rejects the theory on etymological grounds, as does Albert Morley Sturtevant (1951) on the grounds of major difficulties, and their points have led Bruce Lincoln (1977) to comment that "there is no reason whatever to contend that nagl- does not have its usual meaning of "nail" and that Naglfar is anything other than the nail-ship, just as Snorri describes it."
The theory of a non-Indo-European substrate was first proposed by Sigmund Feist, who estimated that about 1/3 of the Proto-Germanic lexical items came from the substrate.
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