At the end of a valuable paper on the superficial deposits to the north and north-west of London, Mr. Barrow puts forward certain views as to the origin of escarpments and transverse rivers in the Chiltern Hills and the Weald which can hardly be allowed to pass unchallenged by those interested in the progress of geomorphology, for unless there is more evidence in their favour than has yet been produced these views are not progressive, but distinctly reactionary. To sum up the position in his own words (op. cit., p. 47): “Long after the cessation of all the bending movements which produced the present structure of the Thames Valley, there was a fall of sea-level or a rise of the sea-bottom that brought the beds within reach of marine erosion.