In a country composed almost entirely of mountain ridges, with intervening hollows of various kinds, it is only natural that the variety in the scenery, produced by the various slopes and aspects of the elevated ground, should give rise to a descriptive nomenclature of corresponding variety. This is especially remarkable in Gaelic; and the tourist in the Scottish Highlands will not travel far without meeting, in addition to the _Ben_ and _Ard_ already mentioned, the following specific designations:-- _Drum_--a ridge. _Scour_--a jagged ridge or peak. _Cruach_--a conical mountain. _Mam_--a slowly rising hill. _Maol_--a broad, flat, bald mountain. _Monagh_--an upland moor. _Tulloch_ or _Tilly_--a little hill, a knoll. _Tom_--a hillock, a mound. _Tor_--a hillock, a mound. _Bruach_--a steep slope (Scotch brae). _Craig_--crag, cliff. _Cairn_--a heap of stones. _Lairg_--a broad, low slope. _Letter_--the side of a hill near the water. _Croit_--a hump. _Clach_--a stone. _Lech_--a flagstone. In the Lowlands, _pen_, _law_, _fell_, _bræ_, _hope_, _rise_, _edge_, indicate similar varieties. Among these _pen_, as distinguished from the northern _ben_, evidently points to a Welsh original. _Hope_ is a curious word, which a south-country gentleman once defined to me as “the point of the low land mounting the hill whence the top can be seen.” Of course, if this be true, it means an elevation not very far removed from the level ground, because, as every hill-climber knows, the top of a huge eminence ceases to be visible the moment you get beyond what the Greeks call the “fore-feet” of the mountain.