Although I love the building, it is in truth, little more than a shelter in a storm. This is, at heart, the house occupied by the Campbells at the end of the nineteenth century, built for them by their landlord, Patrick Sellar, the Mathesons’ tenant, in the 1870s. The Campbells left the Shiants in 1901, and in the next twenty years or so the house partially collapsed, losing a gable. In 1926, the novelist Compton Mackenzie, who owned the islands at the time, rebuilt it. Mackenzie only ever stayed here for a day or two at a time and the house remains almost exactly as he left it: primitive. Its stone walls are pebble-dashed – ‘harled’ is the Scottish term – and have been painted over and over again with Snowcem, a white cement-based paint. It has a tin roof on which the rain patters and across which the wind for some reason roars. Perhaps the attic space makes a kind of sounding box. There are two small rooms, one to the north, one to the south, each with a fireplace in the gable-end wall and both panelled with tongue-and-grooved lining board. It is, from time to time, rat-infested. The rats skitter across the roof, climb down the chimneys and make their nests between the panelling and the stone behind it. There is no electricity, lavatory or running water but it is possible with a good fire going, and a glass or two of whisky, to make the house feel snug and happy, a glow of inner warmth and outer on the faces of everyone around the table. And it can be beautiful on a summer morning, with the day bright outside, to sit in the kitchen, writing at the table there, the thick walls keeping the house cool in the heat, the light coming through the open door, the quiet self-sufficiency of the house a measure of contentment and containment. If it is always a little severe on arrival – cold, ratty; not much of a human habitation – an hour or two of a lit fire, of cleaning the surfaces, lighting the paraffin lamps, somehow driving out the sense that you are not entirely welcome here, in other words rehumanising the shell of it, and the house begins to acquire a certain friendliness. People have often been happy here and the walls have absorbed some of that delight.

      I don’t mind this crudity. It is quite unfeminine. There are no curtains. I am afraid to say that the smears and scrabblings which the rats have left on the walls since they were last painted four or five years ago are still there. The hook from which my father suspended his bags of food in the 1930s still hangs from the ceiling. The guttering candles and smoking lanterns have coated the ceilings with a film of grey soot. Women don’t like it much. Compton MacKenzie could never persuade his wife to stay there with him. My own mother only went once and never again. Sarah, my wife, has braved it twice but not with much enthusiasm and will not, I think, return. Although in the 1930s, and again after the war, picnics of fishing families from Scalpay went out there for the day, the women sitting on the grass in their floral prints and their cardigans, this is not now a female place. Of course, for centuries it must have been as much woman’s as man’s country, but the islands’ modern isolation has masculinised them, as though they have become part of the sea, which is the male domain. ‘You see that hill there?’ Joan MacSween, the widow of a fisherman on Scalpay said to me, ‘That’s as near as I would ever like to get to the sea.’ She was pointing at a rock outside her front door. The shepherds now never take their wives or girlfriends.

      After dumping my belongings in the house, and gathering some driftwood and lighting a fire, the first task is to collect some water. I keep a bucket and a shallow dish in the house. There are five or six wells along the foot of the cliff that lines the landward edge of the island’s coastal strip. One or two have beach cobbles arranged around them, to make them easier to use. Others are scarcely more than scoops in the turf, in which the water seeping from the hill naturally gathers. None is datable. A friend of my father’s relined one with the stones he found nearby twenty years ago. Now, although the water-level in it is for some reason a little lower than before, there is no telling it from the others. It might as well have been done a thousand years ago.

      The best well at the moment is about a hundred yards from the house. A large piece of driftwood acts as its cover. Silverweed fringes it and a flake of the lichen on the rocks sometimes falls off into the water where it floats as a shallow scooped raft. Water boatmen skid in from either side. It is no good if you plunge the bucket deep into the pool. All you are left with is a brownish and unappetising bucket of stirred-up, peaty soup. But if you take the shallow dish and allow no more than a sixteenth of an inch to slip in over the brim, filling the dish with no disturbance to the body of the water in the pool, you will slowly acquire a bucket of clean, fresh spring water filtered from the hill above.

      This gathering of the Shiants’ sweet water, which has never, even in the driest summers, run out, always feels to me like an engagement with one of the oldest layers in the place. Where the materials like this are constant, and the uses to which they are put will always be the same whatever your beliefs, or language, or habit of mind, history collapses. It is as if time has not passed. This delicate sipping at an island spring is the same now as it must always have been. That is the key to something central about the Shiants. History does not move here in a single current, sweeping everything up into one comprehensive pattern of change, but in a laminar flow, different sheets of time moving at different rates, one above the other, like the currents in the sea. At the lowest level, the coldest and oldest, there is virtually no movement. Life down there is still. Gather the water at the well and you are performing a Bronze Age act. Dig over the peaty soil in the vegetable garden and you are doing what has been done here in the Middle Ages. Call Sarah on the mobile phone and you are doing something that wasn’t possible until the late 1990s. This is not, as people so often say of a landscape, a manuscript on which the past has been written and erased over and over again. It is a place in which many different times coexist, flowing at different speeds, enshrining different worlds.

      In early spring, the place is paddled flat by the flock of barnacle geese that live here in the winter. The grass lies down where they have trampled it and looks like the hair of a teenager; unwashed, brownish, greased. All over the surface of the islands – particularly on Eilean Mhuire and the southern end of Eilean an Tighe, called Mianish – lie the goose droppings from the flock. Most of them, according to Calum MacSween, Compton Mackenzie’s grazing tenant here, only arrived after the Campbells had left in 1901. Their droppings, MacSween said, ‘spoiled the water in the Mary Island pools, which until then had been sweet all year.’ They certainly aren’t now: foetid, sour to look at, too pea-green even to be tasted. But the geese themselves are worth it. Walk down to Mianish along the western shore of Eilean an Tighe, past the lazybeds that rim the first bay, across the little burn that runs to the shore in one of the dips between the ridges, clamber carefully across the black-lichened rocks – a lichen that grows only in the splash zone where the storms can reach it and the grass will not grow for the saltiness – keep your head down, out of sight of the flock, not disturbing the sheep either, which would alert the geese, and try to come on the birds at their grazing. A dog, of course, with all its carelessness, would be a disaster and cannot be allowed. Previously, without much of a shift in mentality, I would have had a gun with me. Certainly the early twentieth-century shepherds, Calum MacSween, and his nephew, Donald Macleod (DB as he was known, Donald Butcher), shot their goose dinners when they came to the Shiants early in the year, when the geese were still in the Hebrides, and again on the final visits in November, before the winter closed in, putting the tups on the islands. Then the geese had returned from their breeding grounds in the far north. The barnacles made a better roast, I am told, than the greylag, but were downier. The man plucking them, or so Hugh MacSween maintains, would emerge ‘looking like Father Christmas’, the mass of fine white feathers clogged in his stubble.

      I am here to look. I feel more protective of the barnacle geese than of any other animal