“I may repeat my conviction that if the prevalent beliefs and traditions concerning Stonehenge were true, and the “bluestone” circles were transported from some distant locality, either as trophies of war or as the sacred treasures of a wandering tribe, it is quite inconceivable that they should have been hewed and chipped, as we now know them to have been, and reduced in some cases to half their dimensions, _after having been carried with enormous difficulty over land and water, and over hills and valleys_. On the other hand, in the glacial drift, which once probably thinly covered the district, the glacial deposits dying out very gradually as we proceed southwards, we have a source from which such stones might probably have been derived. It is quite a well-known peculiarity of the glacial drift to exhibit considerable assemblages of stones of a particular character at certain spots, each of these assemblages having probably been derived from the same source. “I would therefore suggest as probable that when the early inhabitants of this island commenced the erection of Stonehenge, Salisbury Plain was sprinkled over thickly with the great white masses of the sarsen-stones (‘grey wethers’), and much more sparingly with darker coloured boulders (the so-called ‘blue-stones’), the last relics of the glacial drift, which have been nearly denuded away. From these two kinds of materials the stones suitable for the contemplated temple were selected. It is even possible that the abundance and association of these two kinds of materials so strikingly contrasted in colour and appearance, at a particular spot, may not only have decided the site, but to some extent have suggested the architectural features of the noble structure of Stonehenge.” If we grant everything that Prof. Judd states, the question remains--why did the same men in the same place at the same time treat the sarsen and blue stones so differently? I shall show subsequently that there is a definite answer to the question on one assumption. I next come to (2). The important point about these stones is that with the amplitude 26°, at Stonehenge, a line from the centre of the circle over the N.W. stone would mark the sunset place in the first week in May, and a line over the S.E. stone would similarly deal with the November sunrise. We are thus brought in presence of the May-November year. Another point about these stones is that they are not at the same distance from the centre of the sarsen stone circle, which itself is concentric with the temenos mound; this is why they lie at different distances from the mound. Further, a line drawn from the point of the Friar’s Heel over the now recumbent Slaughter Stone with the amplitude determined by Mr. Penrose and myself for the summer solstice sunrise in 1680 B.C. cuts the line joining the stones at the middle point, suggesting that the four untrimmed sarsen stones provided alignments both for the May and June years at about that date.