Many such days of sheer delight they had, and kept the dark cloud resolutely below their horizon. They accommodated their activities to the limited powers of the elders, and took them wherever it was reasonably possible for them to go. They chartered a boat for the day, and took them and all the luncheon-things round from Creux Harbour to Grande Greve, subjecting Charles to long-unaccustomed labours at the oar. In the same way they introduced them to Dixcart Bay, and Derrible, and Greve de la Ville; and, choosing a fit day, they circumnavigated the island again in three boat-loads, landing for lunch on an even keel on Breniere, and penetrating into every accessible cave they came to,--Mrs. Pixley enjoying the wonders in fear and trembling, and breathing freely only when they were safely out in the open once more. And Graeme and Margaret watched the approximating of Hennie Penny and Charles with infinite delight. It needed only a full understanding between these two to complete their own great happiness. But the dark cloud was there, though they might refuse to look at it, and clouds below the horizon have a way of rising, especially dark ones. The post-office in Sark is a cottage, or the part of a cottage, turned from private to public use. In former times the service was of a very perfunctory character, Providence largely taking the place of post-master while that official attended first to his fishing and then to his duties, and any who had good and valid reason to expect a letter came down to the mail-bag where it lay on the beach and went through it for themselves. The advent of visitors accustomed to more exact and business-like methods, however, has done away with this Arcadian simplicity, and now each day when the boat is in, all who prefer not to wait for the tardy delivery at their own houses, collect gradually round the official cottage, and in due course, and after the exercise of virtues, receive their mail across the counter. And some tear their letters open at once, regardless of spectators, and devour them on the spot, but the wiser carry them home for private consumption. For one never knows for certain what of heartbreak and disaster the most innocent-looking envelope may contain. Graeme and Margaret and Miss Penny, however, being in retreat, and having cut the painter with the outside world, had not cultivated the post-office until Charles and Lady Elspeth arrived. But, as Charles had to keep more or less in touch with Throgmorton Street, they had now got into the habit of calling with him for his letters, except when the doing so interfered with the programme for the day. And many an amusing, and sometimes touching, insight did they get there into human nature. Graeme said it was worth while the trouble of going, just to sit in the hedge opposite and watch people's faces, especially the faces of those who tore open their letters and those who got none.