To appreciate more fully Professor Hull's interesting paper “On the Submerged Terraces and River Valleys bordering the Britisli Isles,” it is necessary to refer to the Transactions of the Victoria Institute,inwhich the paper is illustrated by a map showing the contour-lines and soundings. The author thinks that the steep descent from the surface of the 100-fathom plateau to the abyssal floor of the Atlantic is analogous to an escarpment, instancing the Cotteswold Hills and other examples, and argues from this that the steep descent in question has been due to the forces of subaerial denudation, and has had a terrestrial origin.