From the present ruined state of Stonehenge it is not possible to state with certainty what was the original arrangement, but it is probable that it was approximately as follows (see [frontispiece]):
| Fig. 1. Plan of Stonehenge in 1901. (After Archæologia.) The dotted stones are of porphyritic diabase. |
There was an outer circle of about thirty worked upright stones of square section (Fig. I). On each pair of these rested a horizontal block, but only five now remain in position. These 'lintels' probably formed a continuous architrave (Pl. I). The diameter of this outer circle is about 97½ feet, inner measurement. The stones used are sarsens or blocks of sandstone, such as are to be found lying about in many parts of the district round Stonehenge.
| Photo | Graphotone Co. |
| Stonehenge from the South-west | |
| Plate I | To face p. 17 |
Well within this circle stood the five huge trilithons (a-e), arranged in the form of a horseshoe with its open side to the north-east. Each trilithon, as the name implies, consists of three stones, two of which are uprights, the third being laid horizontally across the top. The height of the trilithons varies from 16 to 21½ feet, the lowest being the two that stand at the open end of the horseshoe, and the highest that which is at the apex. Here again all the stones are sarsens and all are carefully worked. On the top end of each upright of the trilithons is an accurately cut tenon which dovetails into two mortices cut one at each end of the lower surface of the horizontal block. Each upright of the outer circle had a double tenon, and the lintels, besides being morticed to take these tenons, were also dovetailed each into its two neighbours.
Within the horseshoe and close up to it stand the famous blue-stones, now twelve in number, but originally perhaps more. These stones are not so high as the trilithons, the tallest reaching only 7½ feet. They are nearly all of porphyritic diabase. It has often been asserted that these blue-stones must have been brought to Stonehenge from a distance, as they do not occur anywhere in the district. Some have suggested that they came from Wales or Cornwall, or even by sea from Ireland. Now, the recent excavations have shown that the blue-stones were brought to Stonehenge in a rough state, and that all the trimming was done on the spot where they were erected. It seems unlikely that if they had been brought from a distance the rough trimming should not have been done on the spot where they were found, in order to decrease their weight for transport. It is therefore possible that the stones were erratic blocks found near Stonehenge.