In 1866 I communicated a paper to the Geological Society of London on the Pleistocene Succession in the Trent Basin. The boulderclays and outwash deposits of this district are of two distinct kinds, the one containing rocks from the west and north-west, and the other boulders etc., from the east or north-east of the district. In all cases, except where they have been ploughed up and re-arranged by the ice itself, the drifts containing westerly rocks only are the lowest, and the drifts with easterly rocks have been spread over them. We thus have two distinct ice-flows to deal with.