sentences:  In the late 19th century, Adolf Noreen proposed that "nagl-" here does not have its usual meaning of "nail", but, instead, is a variant of Old Norse "nár" (meaning "corpse") and ultimately derives from Proto-Indo-European *"nok-w-i".Noreen claimed that the notion of "Naglfar" as a 'nail-ship' is due to a folk etymology; that elaboration on the folk etymology produced the concept of a "nail-ship".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."