estuary has in its wash some dangerous outcropping granite rocks, nearly covered at high tide, and the mouth opens between the most northerly end of the sandhills and the village street, whose houses mark the slope of the detritus from the rocks. Formerly the Water of Cruden, instead of taking this last turn, used to flow straight on till it joined the lesser stream known as the Back Burn, and together the streams ran seawards. Even in comparatively recent years, in times of flood or freshet, the spate broke down or swept over the intervening tongue of land, and the Water of Cruden took its old course seaward. This course is what is known as the Watter's Mou'. It is a natural cleft - formed by primeval fire or earthquake or some sort of natural convulsion - which runs through the vast mass of red granite which forms a promontory running due south. Water has done its work as well as fire in the formation of the gully as it now is, for the drip and flow and rush of water that mark the seasons for countless ages have completed the work of the pristine fire. As one sees this natural mouth of the stream in the rocky face of the cliff, it is hard to realise that Nature alone has done the work.
At first the cleft runs from west to east, and broadens out into a wide bay of which on one side a steep grassy slope leads towards the new castle of Slains, and on the other rises a sheer bank, with tufts of the thick grass growing on the ledges, where the earth has been blown. From this the cleft opens again between towering rocks like what in America is called a canon and tends seaward to the south between precipices two hundred feet high, and over a bottom of great boulders exposed at low water towards the northern end. The precipice to the left or eastward side is twice rent with great openings, through which, in time of storm, the spray and spume of the easterly gale piling the great waves into the Castle Bay are swept. These openings are, however, so guarded with masses of rock that the force of the wildest wave is broken before it can leap up the piles of boulders which rise from their sandy floors. At the very mouth the cleft opens away to the west, where the cliff falls back, and seaward of which rise great masses of black frowning rock, most of which only show their presence at high water by the angry patches of foam which even in calm weather mark them - for the current here runs fast. The eastern portal is composed of a giant mass of red granite, which, from its overhanging shape, is known as "the Ship's Starn". It lies somewhat lower than the cliff of which it is a part, being attached to it by a great sloping shelf of granite, over which, when the storm is easterly, the torrent of spray sent up by the dashing waves rolls down to join the foamy waves in the Watter's Mou'.
Maggie knew that close to the Barley Mill, safe from the onset of the waves - for the wildest waves that ever rise lose their force fretting and churning on the stony sides and bottom of the Watter's Mou' - was kept a light boat belonging to her brother, which he sometimes used when the weather was fine and he wanted to utilise his spare time in line fishing. Her mind was made up that it was her duty to give her father warning of what awaited him on landing - if she could. She was afraid to think of the danger, of the myriad chances against her success; but, woman-like, when once the idea was fixed in her mind she went straight on to its realisation. Truly, thought of any kind would have been an absolute barrier to action in such a case, for any one of the difficulties ahead would have seemed sufficient. To leave the shore at all on such a night, and in such a frail craft, with none but a girl to manage it; then to find a way, despite storm and current, out to the boat so far off at sea; and finally, to find the boat she wanted at all in the fret of such a stormy sea - a wilderness of driving mist - in such a night, when never a star even was to be seen: the prospect might well appal the bravest.
But to think was to hesitate, and to hesitate was to fail. Keeping her thoughts on the danger to her father, and seeing through the blackness of the stormy night his white, woe-laden face before her, and hearing through the tumult of the tempest his sobs as on that night when her fear for him began to be acute, she set about her work with desperate energy. The boat was moored on the northern side of the largest of the little islands of sea-grass, and so far in shelter that she could get all in readiness. She set the oars in their places, stepped the mast, and rigged the sail ready to haul up. Then she took a small spar of broken wood and knotted to it a piece of rope, fastening the other end of the rope, some five yards long, just under the thwarts near the centre of the boat, and just a little forward on the port side. The spar she put carefully ready to throw out of the boat when the sweep of the wind should take her sail - for without some such strain as it would afford, the boat would probably heel over. Then she guided the boat in the shallow water round the little island till it was stern on to the sea side. It was rough work, for the rush and recoil of the waves beat the boat back on the sandy bank or left her now and again dry till a new wave lifted her.
All this time she took something of inspiration from the darkness and the roar of the storm around her. She was not yet face to face with danger, and did not realise, or try to realise, its magnitude. In such a mystery of darkness as lay before, above, and around her, her own personality seemed as nought. Truly there is an instinct of one's own littleness which becomes consciously manifest in the times when Nature puts forth her might. The wind swept up the channel of the Watter's Mou' in great gusts, till the open bay where she stood became the centre of an intermittent whirlwind. The storm came not only from the Mouth itself, but through the great gaps in the eastern wall. It drove across the gully till high amongst the rocks overhead on both sides it seemed now and again to scream as a living thing in pain or anger. Great sheets of mist appeared out of the inky darkness beyond, coming suddenly as though like the great sails of ships driving up before the wind. With gladness Maggie saw that the sheets of fog were becoming fewer and thinner, and realised that so far her dreadful task was becoming possible. She was getting more inspired by the sound and elemental fury around her. There was in her blood, as in the blood of all the hardy children of the northern seas, some strain of those study Berserkers who knew no fear, and rode the very tempest on its wings with supreme bravery. Such natures rise with the occasion, and now, when the call had come, Maggie's brave nature answered it. It was with a strong, almost an eager, heart that she jumped into the boat, and seizing the oars, set out on her perilous course. The start was difficult, for the boat was bumping savagely on the sand; but, taking advantage of a big wave, two or three powerful strokes took her out into deeper water. Here, too, there was shelter, for the cliffs rose steeply; and when she had entered the elbow of the gully and saw before her the whole length of the Watter's Mou', the drift of the wind took it over her head, and she was able to row in comparative calmness under the shadow of the cliffs. A few minutes took her to the first of the openings in the eastern cliff, and here she began to feel the full fury of the storm. The opening itself was sheer on each side, but in the gap between was piled a mass of giant boulders, the work of the sea at its wildest during the centuries of stress. On the farther side of these the waves broke, and sent up a white cloud of spume that drove instantly into the darkness beyond. Maggie knew that here her first great effort had to be made, and lending her strength pulled the boat through the turmoil of wind and wave. As she passed the cleft, driven somewhat more out into the middle of the channel, she caught, in a pause between the rush of the waves, a glimpse of the lighted windows of the castle on the cliff. The sight for an instant unnerved her, for it brought into opposition her own dreadful situation, mental and physical, with the happy faces of those clustered round the comforting light. But the reaction was helpful, for the little jealousy which was at the base of the idea was blotted out by the thought of that stem and paramount duty which she had undertaken. Not seldom in days gone by had women like her, in times of test and torment, taken their way over the red-hot ploughshares under somewhat similar stress of mind.
She was now under the shelter of the cliff, and gaining the second and last opening in the rocky wall: as the boat advanced the force of the waves became greater, for every yard up the Watter's Mou' the fretting of the rocky bottom and sides had broken their force. This was brought home to her roughly when the breaking of a coming wave threw a sheet of water over her as she bent to her oars. Chop! chop! went the boat into the trough of each succeeding wave, till it became necessary to bale out the boat or she might never even get started on her way. This done she rowed on, and now came to the second opening in the cliff. This was much wilder than the first, for outside of it, to the east, the waves of the North Sea broke in all their violence, and with the breaking of each a great sheet of water came drifting over the wall of piled up boulders. Again Maggie kept out in the channel, and, pulling with all her might, passed again into the shelter of the cliff. Here the water was stiller, for the waves were breaking directly behind the sheltering