During the past two years the Sedgwick Club has been at work on the glacial deposits in the neighbourhood of Cambridge, with special reference to the boulders contained therein. As usual, the great majority of the boulders are of local origin, but far-travelled rocks are fairly abundant, and several hundred specimens which appeared likely to be of interest have been collected. By the kindness of Professor T. McKenny Hughes, F.R.S., about fifty of the more promising types have been sliced.