It is remarkable how greatly the set stones vary in size. Some are quite insignificant, and could be planted by a boy, while others require the united efforts of three, four, or even many men, with modern appliances of three legs and block, to lift and place them in position. This seems to show that the rows are not the result of concerted design, but of individual execution as the ability of the man or family permitted to set up a stone large or small. Usually the largest stones are planted near the cairn, and they dwindle to the blocking-stone, which is of respectable size.
There is no district known so rich in stone rows as Dartmoor. As many as fifty have been observed. The finest are those of Drizzlecombe, where there are three double rows, not parallel; Down Tor, a single line; Merrivale Bridge, two parallel double rows, but the stones constituting them small; Stall Moor, a single line that looks like a procession of cricketers in flannels stalking over the moor; Challacombe; at Glazebrook are thirteen rows; also Staldon Moor. Some of these rows which are small are nevertheless instructive. On the north slope of Cosdon is a cairn that originally contained three kistvaens, one of which is perfect, one exists in part, and evidence of the existence of the third was found on exploration. From this cairn start three rows of stones, one for each kistvaen. A remarkably perfect set of stone rows is on Watern Hill, behind the Warren Inn, on the road from Post Bridge to Moreton. It is actually visible from the road, but as the stones are small it does not attract attention. It starts from a cairn and a tall upright stone set at right angles to the rows, which are brought to a termination by blocking-stones. Another perfect row is at Assacombe, starting from a cairn with two or three big upright stones, and running down a rather steep hill to a blocking-stone which remains intact.
The longest of all the rows is that on Staldon, which springs from a circle of 59 feet 9 inches in diameter, inclosing the remains of a cairn, runs with a single line for two miles and a quarter, and crosses the Erme river. Had a straight line been followed, an obstruction in the precipitous bank of the river would have been encountered, to avoid which the builders of this great monument took a sweep eastward, where the bank was more sloping. In the Cosdon lines of stones already referred to, the rows waver so as to avoid a platform of rock in which the constructors were unable to plant their stones.