Lee translated and arranged Keller's first six reports, his work was fairly representative of the progress then made in lake-dwelling researches; but to keep pace with this progress a second edition at the end of the following decade assumed the magnitude of two large volumes. Since then, however (1878), the results of lacustrine researches have been greater and more important than during any previous corresponding period. The "Correction des Eaux du Jura," together with various harbour alterations in the lakes of Zürich, Geneva, etc., have been the means of enormously increasing the lacustrine collections of Switzerland. In North Italy not only have new and remarkably interesting lacustrine stations been discovered and exhaustively investigated, as Lagozza and Polada, but the researches in the terremare have been such as to entirely alter the previous opinions held in regard to them. Nor has the progress in this field of research in many other countries in Europe been scarcely less important, in proof of which I have only to mention the additions made to the Scottish and Irish crannogs; the curious fascine structures brought to light in Holderness, Yorkshire; the novel revelations extracted from the _terp_ mounds in Holland and other low-lying districts on the coast of the German Ocean; the greatly extended and more accurate details of lacustrine structures in North Germany; the discovery in Hungary of prehistoric mounds analogous to the terramara deposits of Italy, etc. In short there is hardly any corner of the lake-dwelling area in Europe which has not yielded new materials, throwing more or less light on this strange phase of prehistoric life.