It is now more than eleven years since I ventured to take a part in the discussion then raised by Professor Ramsay having lately published his celebrated theory of the Erosion of Lake-Basins by the lower ends of Glaciers, where they may have formerly expanded over a more level country, beyond the confines of their parent valleys. It appears to be admitted that a great many lakes lie in positions where it would be natural to suppose them so formed, if only glaciers could have possessed the crosive powers necessary for the purpose. The positions of the deeper parts of the lakes also accord well with the theory.