Historians are too much in the habit of paying attention only to the brilliant, clamorous and ephemeral manifestations of human activity, to great events and great men, instead of depicting the great and slow changes of economic conditions and social institutions, which constitute the really interesting … part of human development …. most of the events that are called historical have the same relation to real history as the waves which rise up from the surface of the sea, gleam in the light for a moment and break on the sandy shore, leaving no trace behind them, have to the deep and constant motion of the tides