In framing a theory attributing the terraced form of limestone outcrops in the Yorkshire Dales to glacial erosion, Mr. Goodchild was doubtless prepared to encounter much adverse criticism. If in this communication I venture to differ from his views, he will believe that it is in no captious spirit. The district in Northumberland from which I write supplies materials for criticism of the most relevant kind, presenting as it does the same series of Carboniferous rocks cropping out in surface features closely allied, and subjected in the Glacial Period to the pressure of the same ice-sheet. The terraces of Wensleydale, too, are not wholly unfamiliar to me.