On the sides of the tors are what are locally termed "clitters" or "clatters" (Welsh clechr), consisting of a vast quantity of stone strewn in streams from the tors, spreading out fanlike on the slopes. These are the wreckage of the tor when far higher than it is now, i.e. of the harder portions that have not been dissolved and swept away.

"The tors—Nature's towers—are huge masses of granite on the top of the hills, which are not high enough to be called mountains, piled one upon another in Nature's own fantastic way. There may be a tor, or a group of tors, crowning an eminence, but the effect, either near or afar, is to give the hilltop a grand and imposing look. These large blocks of granite, poised on one another, some appearing as if they must fall, others piled with curious regularity—considering they are Nature's work—are the prominent features in a Dartmoor landscape, and, wild as parts of Dartmoor are, the tors add a notable picturesque effect to the scene. There are very fine tors on the western side of the moor. Those on the east and south are not so fine as those on the north and west. In the centre of the moor there are also fine tors. They are, in fact, very numerous, for nearly every little hill has its granite cap, which is a tor, and every tor has its name. Some of the high hills that are tor-less are called beacons, and were doubtless used as signal beacons in times gone by. As the tors are not grouped or built with any design by Nature to attract the eye of man, they are the more attractive on that account, and one of their consequent peculiarities is that from different points of view they never appear the same. There can be no sameness in a landscape of tors when every tor changes its features according to the point of view from which you look at it. Every tor also has its heap of rock at its feet, some of them very striking jumbles of blocks of granite scattered in great confusion between the tor and the foot of the hill. Fur Tor, which is in the very wildest spot on Dartmoor, and is one of the leading tors, has a clitter of rocks on its western side as remarkable as the tor itself; Mis Tor, also on its western side, has a very fine clitter of granite; Leather Tor stands on the top of a mass of granite rocks on its east and south sides; and Hen Tor, on the south quarter, is surrounded with blocks of granite, with a hollow like the crater of a volcano, as if they had been thrown up by a great convulsion of Nature. Hen Tor is remarkable chiefly for this wonderful mass of granite blocks strewn around it. All the moor has granite boulders scattered about, but they accumulate at the feet of the tors as if for their support."[3]

VIXEN TOR

Here among the clitters, where they form caves, a search may be made for the beautiful moss Schistostega osmundacea. It has a metallic lustre like green gold, and on entering a dark place under rocks, the ground seems to be blazing with gold. In Germany the Fichtel Gebirge are of granite, and the Luchsen Berg is so called because there in the hollow under the rocks grew abundance of the moss glittering like the eyes of a lynx. The authorities of Alexanderbad have had to rail in the grottoes to prevent the gold moss from being carried off by the curious. Murray says of these retreats of the luminous moss:—

"The wonder of the place is the beautiful phosphorescence which is seen in the crannies of the rocks, and which appears and disappears according to the position of the spectator. This it is which has given rise to the fairy tales of gold and gems with which the gnomes and cobolds tantalise the poor peasants. The light resembles that of glow-worms; or, if compared to a precious stone, it is something between a chrysolite and a cat's-eye, but shining with a more metallic lustre. On picking up some of it, and bringing it to the light, nothing is found but dirt."

Professor Lloyd found that the luminous appearance was due to the presence of small crystals in the structure which reflect the light. Coleridge says:—

"'Tis said in Summer's evening hour,
Flashes the golden-coloured flower,
A fair electric light."