People who walk in mountains grow accustomed to finding their movements facilitated from time to time by what the mountaineering books call ‘corridors’ or ‘high-level routes,’ in places where one might have expected nothing but large stones. There is a famous one from Zermatt to Arolla. There is a little one between Stye Head and Sea Fell, running from Skew Ghyll to the Ling Mell col above Hollow Stones. There is another—improved but not created by man—along the north face of Pillar Mountain. Of the same nature, and equally unexpected at first, are the ‘rakes’ and ledges which sometimes run right across a rock face, and assist, as one might say, the tactics of the mountaineer, just as the major high-level routes assist him in his strategy. They may even assist the faint-hearted to get off a face altogether. Or, of course, such a ledge may be upside down, and then it is not so good.