This article is something both more and less than the lecture that it represents. The lecture was given in London last December to open the Conference on the Southern British Iron Age which is reported here below by Mr Frere (p. 183). But it had the disadvantage of all introductory lectures to conferences, that they cannot anticipate what the other speakers will be saying later. And in this case, what the others said later was sometimes so new and striking as to leave the introductory lecture rather far behind. Of course, that was the measure of the conference’s success; yet I was gratified to find that what had happened, by the end, was that the others had not so much contradicted as carried further, in their various special fields, much of what was suggested in my more general talk. This surely means—and I think we can be gratified all round—that in the dozen years since the Council for British Archaeology last caused a general survey to be put forward, or the twenty years since Childe was writing in Prehistoric Communities, we have taken our Iron Age studies through a process of expansion, and of revaluation, and yet have emerged still pretty well together.These milestones in their history are worth remembering. Horae Ferales, in which Kemble and Franks first brought our Iron Age metalwork to recognition, appeared in 1863, and John Evans’s Coins of the Ancient Britons in 1864; Arthur Evans’s monograph on the Aylesford cemetery, with both metalwork and pottery shown for the first time in their European setting, in 1890; Canon Greenwell’s on the Yorkshire chariot-burials in 1906.