In another mile and a half, after passing Lyre Geo and Inganess Geo, two impressive examples of how rocks decay, we reach the Castle of North Gaulton, a singularly slender and graceful pillar of rock. Then we cross a stretch of low ground, after which there is a steep climb up to the summit of the Black Craig. The height of the hill is 360 feet, and that of the cliff little less, while its sheer plunge down into the waves makes it look higher than it really is. As we descend towards the south we pass over a district which is sacred in the eyes of geologists, for it was here that Hugh Miller discovered the fossil remains of the _Asterolepis_ or “star-scale” fish, a monster of the ancient days when the rocks of this hill were being laid down as mud and sand on the bottom of a primeval lake. The great geologist describes this district as “the land of fish,” and the rock strata fairly swarm with fossils. The shore in front is now low and tame, but the whole district from hill to sea is fertile and well peopled. That it was so in the past also we see sufficient proof. For there, on the shore of Breckness, stand the ruins of a mansion built by Bishop Graeme, who knew well where to build; and a mile beyond it, in the lonely churchyard by the lonely sea, rises a fragment of an ancient church. There stood the church of Stromness in former days, and there also the manse; while the names of Innertown and Outertown doubtless refer to their relative nearness to this centre of parish life. [Illustration: _Round about Stromness._ 1. Dundas Street. 2. Church Road. 3. Victoria Street. 4. From the South End. 5. From the Harbour. 6. From the Hill.] But times have changed, and it is no longer fertility of soil but convenience for trade which draws men together in close neighbourhood, and so the modern Stromness arose on the shore of that romantic little bay which spreads out beneath us as we cross the ridge to the left. That landlocked sea, and not the rocky hillside, was the source of its life and growth; and as we note the frequent steamships and the clustered fishing-fleet we realize that it is still the sea which brings prosperity to the little gray town. Here, then, our circuit of the Mainland fitly ends, for in the opinion of many the town of Stromness, the “ness of the tide-stream,” is the fairest spot in all the islands. However this may be, it is indeed fair, and the Stromness boy will wander far and sail over many seas ere he will find a fairer scene than his island home;—fair when it lies before him under the pearl-gray light of its northern sky; fairer still, perchance, when the golden haze of memory gilds the landscape, and the joyous vision of the outward eye has given place to the wistful retrospect of the imagination. [Illustration: _The Black Craig._] SKETCHES BY HUGH MILLER. The Dwarfie Stone.