Besides these there are even now eleven stones, some standing, others thrown down, but still existing, within the inner circle. These are of a different nature, being all cut from igneous rocks, such as are not to be found nearer than Cornwall or even Ireland. It has not been exactly ascertained whence they came; indeed, they seem to be of various kinds, and consequently must have been brought from different places. Locally they are called Blue stones, and it may be well to adopt that short title for the present, as involving no theory, and as sufficing to distinguish them from the local Sarsens. [Illustration: 24. Plan of Stonehenge restored.] None of the blue stones are large; one of the finest (23 in Sir R. Colt Hoare's plan) is 7 feet 6 inches high, 2 feet 3 inches wide at base, tapering to 1 foot on top. The others are generally smaller. One blue stone opposite 23 is grooved with a channel from top to bottom, though for what purpose it is not easy to guess. On the most cursory glance, it is evident that these stones generally stood in pairs, about 3 feet apart; but some are so completely overthrown and displaced, that it is not quite clear whether this can be predicated of all. Entering the choir on the left hand we find one that seems to stand alone. But we may infer that this was not always so, from the circumstance that there lies close by it an impost stone with two mortice holes in it, only 3 feet 6 inches apart, which must have belonged to a smaller order of trilithons, and is just such as would fit a pair of blue stones. The next pair on the left is very distinct, and stands between the two great trilithons. The next pair is also similarly situated. On the opposite side there are two pairs, but situated, as far as can be made out, in front of, and not between the trilithons; and again, there are two blue stones behind the stone called the Altar stone, but so displaced by the fall of the great trilithon behind them, that it is impossible to make out their original position with certainty.