Every science which deals with human phenomena is in a way an implement in this great factory system, in which the past is welded together again. Psychology has been drawn upon to interpret the movements of revolutions or religions, anthropology and ethnology furnish a clue to problems to which the key of documents has been lost. Genealogy, heraldry and chronology run parallel with the wider subject. But the real auxiliary sciences to history are those which deal with those traces of the past that still exist, the science of language (philology), of writing (palaeography), of documents (diplomatic), of seals (sphragistics), of coins (numismatics), of weights and measures, and archaeology in the widest sense of the word. These sciences underlie the whole development of scientific history. Dictionaries and manuals are the instruments of this industrial revolution. Without them the literary remains of the race would still be as useless as Egyptian inscriptions to the fellaheen. Archaeology itself remained but a minor branch of art until the machinery was perfected which enabled it to classify and interpret the remains of the "pre-historic" age. This is the most remarkable chapter in the whole history of history--the recovery of that past which had already been lost when our literary history began. The perspective stretches out as far the other side of Homer as we are this. The old "providential" scheme of history disintegrates before a new interest in the "gentile" nations to whose high culture Hebrew sources bore unwilling testimony. Biblical criticism is a part of the historic process. The Jewish texts, once the infallible basis of history, are now tested by the libraries of Babylon, from which they were partly drawn, and Hebrew history sinks into its proper place in the wide horizon of antiquity. The finding of the Rosetta stone left us no longer dependent upon Greek, Latin or Hebrew sources, and now fifty centuries of Egyptian history lie before us. The scientific historian of antiquity works on the hills of Crete, rather than in the quiet of a library with the classics spread out before him. There he can reconstruct the splendour of that Minoan age to which Homeric poems look back, as the Germanic epics looked back to Rome or Verona. His discoveries, co-ordinated and arranged in vast _corpora inscriptionum_, stand now alongside Herodotus or Livy, furnishing a basis for their criticism. Medieval archaeology has, since Quicherat, revealed how men were living while the monks wrote chronicles, and now cathedrals and castles are studied as genuine historic documents.