At some wells, what the water lacked in the matter of efficacy was supplied by certain stones lying by their margins. These stones, in virtue of a real or fancied resemblance to parts of the human body--such as the eye or arm--were applied to the members corresponding to them in shape, in the expectation that this would conduce to a cure. At Killin, in Perthshire, there are several stones dedicated to Fillan, at one time much used in the way described. These are, however, not beside a spring, but in the mill referred to in a previous chapter. They lie in a niche in the inner wall, and have been there from an unknown past. Whenever a new mill was built to replace the old one, a niche was made in the wall for their reception. They are some seven or eight in number. The largest of them weighs eight lbs. ten oz. Special interest attaches to at least two of them, on account of certain markings on one side, consisting of shallow rounded hollows somewhat resembling the cup-marks which have proved such a puzzle to archæologists. There is reason to believe that the stones in question were at one time used in connection with milling operations, the hollows being merely the sockets where the spindle of the upper millstone revolved. On the saint's day (the ninth of January), it was customary till not very long ago, for the villagers to assemble at the mill, and place a layer of straw below the stones. This custom has a particular interest, for we find a counterpart to it in Scandinavia, both instances being clearly survivals of stone-worship. "In certain mountain districts of Norway," Dr. Tylor tells us in his "Primitive Culture," "up to the end of the last century, the peasants used to preserve round stones, washed them every Thursday evening (which seems to show that they represented Thor), smeared them with butter before the fire, laid them on the seat of honour on fresh straw, and at certain times of the year steeped them in ale, that they might bring luck and comfort to the house." The ritual here is more elaborate than in the case of the Killin stones; but the instances are parallel as regards the use of straw. Fully a couple of miles from Killin, below Mornish, close to Loch Tay, is the lonely nettle-covered graveyard of Cladh Davi, and on a tombstone in its enclosure lie two roundish stones, believed to belong to the same series as those in the mill, and marked with similar hollows. These stones were thought to cure pectoral inflammation, the hollows being filled with water, and applied to the breasts. The Rev. Dr. Hugh MacMillan, after describing the stones in the volume of the "Proceedings of the Society of Antiquaries of Scotland" for 1883-84, mentions that "not long since, a woman, who was thus afflicted, came a considerable distance, from the head of Glen Lochay, to make use of this remedy."