ABSTRACT
During the latter part of the nineteenth century it becomes increasingly difficult to assess, on a purely contemporary basis, the relevance to landscape studies of much of the quantitative work then being undertaken, particularly by hydraulic and civil engineers. In the period 1846 to 1875, already discussed in Part 3, the quantitative investigations, and especially those relating to the transportation mechanics of streams, were of immediate physiographic significance because of the support they gave to the fluvialistic cause; but the geomorphic importance of much of the work now to be described was obscured until recently by the qualitative veil which W.M.Davis threw over geomorphology for half a century. It is because of this obscurity that we feel it imperative to mention some of the remarkable advances in quantitative and dynamic topics made between 1875 and 1890.
