Emory Adams Allen, The Prehistoric World; Or, Vanished Races
“ In no country is there a hard and fast line separating the historic period from the prehistoric. In the dim perspective of years the light gradually fades away, the mist grows thicker and thicker before us, and we at last find ourselves face to face with the unknown past. This extensive period of time is not, however, utterly lost to us. We have simply to gather our information in some other way. Enthusiastic explorers, digging beneath the ashes of Vesuvius, have brought to light the remains of an entombed city. ”
