Do we ask for proof of re-orientation, as a result of the immigration of a new race of men? We are thrown back on a further series of intricate astronomical data, reinforced by similar details relating to Egyptian temples. It may be that the objector has some misgivings as to the exactitude of the orientation of these very temples--that is a small matter--but he would like to know the reason for placing our rough, unhewn cromlechs and menhirs in the same category. To the general archaeologist, the comparison between our rude “amorpholiths” and an elaborate Eastern temple is not just. Such a person asks questions about the instruments which the builders of the megaliths may have used in their observations, about the possible obstacles which may have blocked out of view portions of the horizon, about the difficulty in ascertaining which standard line was used, where all the monoliths are so crude and irregular. Again, which was considered the time of sunrise--the moment when the sun’s rim peeped above the horizon, or when his centre was clearly visible? Each position has been assumed, the one in England, the other in Egypt. In the ages when not even the Julian calendar had been invented, could primitive folk know, for certain, the exact date of the solstice? In England, the sun rises on the slant: where was the observer’s eye placed in relation to that oblique line? In one Cornish instance, at least, it has been asserted that the stones from which the alinement had been taken cannot be seen from the central group of stones[633]. And of Sidbury Hill, which was deemed so important in the Stonehenge measurements, Dr T. Rice Holmes declares that it cannot be seen from that monument, only the trees on its summit being visible[634].