Republicanism, spread of, [425].
Research, foundations of, [472]; educational process of, [479].
Revival of learning, [364].
River and glacial drift, [74].
Roebuck, John, the blast furnace, [436].
Roman civil organization, [258].
Roman empire, and its decline, [264].
Roman government, [258]; law, [259]; imperialism, [267].
Roman social life, [264].
Rome a dominant city, [257]; development of government, [258].