Joel Cook,
America, Volume 4 (of 6)
“ The first white man who saw them was Father Louis Hennepin, the Franciscan, in 1678, who described them as "a vast and prodigious cadence of water which falls down after a surprising and astonishing manner, insomuch that the universe does not afford its parallel. The waters which fall from this horrible precipice do foam and boil after the most hideous manner imaginable, making an outrageous noise more terrible than that of thunder, for when the wind blows out of the south their dismal roaring may be heard more than fifteen leagues off." ”
