Archibald Geikie,
Scottish Reminiscences
“ A deep cleft on a mountain-crest, a bowl-shaped hollow scooped out of a hillside, a profound ravine, a conical mound or a group of such mounds, rising conspicuously above a bare moorland, a solitary boulder of gigantic size, or a line of large boulders—these and many other prominent elements in the scenery, alike of the Lowlands and the Highlands, have arrested attention from the earliest times. ”
