Off the south-west end of Aros these blocks are very many, and much greater in size. Indeed, they must grow monstrously bigger out to sea, for there must be ten sea miles of open water sown with them as thick as a country place with houses, some standing thirty feet above the tides, some covered, but all perilous to ships; so that on a clear, westerly blowing day, I have counted, from the top of Aros, the great rollers breaking white and heavy over as many as six-and-forty buried reefs. But it is nearer in shore that the danger is worst; for the tide, here running like a mill-race, makes a long belt of broken water--a _Roost_ we call it--at the tail of the land. I have often been out there in a dead calm at the slack of the tide; and a strange place it is, with the sea swirling and combing up and boiling like the caldrons of a linn, and now and again a little dancing mutter of sound as though the _Roost_ were talking to itself. But when the tide begins to run again, and above all in heavy weather, there is no man could take a boat within half a mile of it, nor a ship afloat that could either steer or live in such a place. You can hear the roaring of it six miles away. At the seaward end there comes the strongest of the bubble; and it's here that these big breakers dance together--the dance of death, it may be called--that have got the name, in these parts, of the Merry Men. I have heard it said that they run fifty feet high; but that must be the green water only, for the spray runs twice as high as that. Whether they got the name from their movements, which are swift and antic, or from the shouting they make about the turn of the tide, so that all Aros shakes with it, is more than I can tell. The truth is, that in a south-westerly wind, that part of our archipelago is no better than a trap. If a ship got through the reefs, and weathered the Merry Men, it would be to come ashore on the south coast of Aros, in Sandag Bay, where so many dismal things befell our family, as I propose to tell. The thought of all these dangers, in the place I knew so long, makes me particularly welcome the works now going forward to set lights upon the headlands and buoys along the channels of our iron-bound, inhospitable islands.