=Pot-holes= are frequent in the Yorkshire limestone. The rivers for considerable distances have underground courses. At each spot where the roof of one of these tunnels happens to fall in a 'pot-hole' is produced. They are very numerous about Settle and Clapham. Some are of very great depth and can only be explored with the aid of much cordage and many lights. The explorer of pot-holes has to face all the perils of severe rock climbing, and, moreover, to face them for the most part in the dark. It would be hard to imagine anything more weird than one of these darksome journeys, rendered doubly impressive by the roar of unseen waters and the knowledge that abrupt pitches of vast depth are apt to occur in the course of the channel without the slightest warning. (See _Alum Pot_, _Dunald Mill Hole_, _Gaping Gill Hole_.) =Pow=: a sluggish rivulet. =Professor's Chimney.=--A name bestowed by Messrs. Hopkinson on the exit most towards the left hand as one comes up _Deep Gill_ on _Scafell_. Out of this chimney, again to the left, diverges that which leads up to the neck between the _Scafell Pillar_ and its Pisgah. To this latter chimney the name is erroneously applied by many, though, indeed, they might urge with some reason that if it comes to a scramble for one name between two gullies the more frequented ought to get it. =Rainsborrow Crag.=--A noble rock in Kentdale, Westmorland. It is, perhaps, most easily got at from Staveley, but from Ambleside it is only necessary to cross the Garbourne Pass, and the crag is at once conspicuous. It is of the same type as _Froswick_ and _Ill Bell_, but finer and more sheer than either of them. =Rake=: a word common in Derbyshire, Yorkshire, and the Lakes, which has been much misunderstood. It usually happens to be a scree-gully, but the fundamental idea is straightness.