Orientation in barrow burials having been considered, one is easily led to discuss an allied subject, in part connected with interments, in part not so strictly related, yet tinged with like primitive ideas. This topic is the orientation of megaliths and ancient earthworks, and it has been so prominently put forward by Sir Norman Lockyer that no archaeologist can pretend to be alert and watchful who has not, to some extent, followed the discussion. Hence a notice, however slight and imperfect, is demanded. Sir Norman Lockyer has made careful triangulations and measurements in connection with the prehistoric monuments of Cornwall, Wiltshire, and other counties, and his general conclusion is, that the axes of these monuments, and their mutual geographical relations, were carefully determined by their constructors. The assumption having been made that the monuments were originally alined to sunrise, the problem has been to calculate when that arrangement could have existed, because now, owing to the alteration of the inclination of the earth’s equator with regard to the ecliptic, the solstitial points have considerably shifted their positions. Stonehenge, which Sir Norman Lockyer considers to have been a solstitial temple, was accurately alined by astronomical means when erected. He believes that the original alinement of the circles was adapted (_c._ B.C. 2200) to a “farmer’s year,” May to November; but that, about B.C. 1600, a new cult was introduced, probably from Egypt, and the lines of orientation were changed to harmonize with a June-to-December year[629]. The investigation has also been applied to other monuments, and it is claimed that not only can we determine to what star a particular megalith was originally oriented, but, as a consequence of this determination, we can discover the approximate date also of the erection of the stones[630]. To any one who, like the present writer, is not a skilled practical astronomer, the evidence is difficult to handle, for the actual observations and measurements must, of necessity, be implicitly accepted. Yet, on general grounds, one cannot avoid the thought that the assumptions are not self-evidently true, and that even if this were the case, the theory is pushed much further than seems reasonable. These objections have been raised by several writers, and the views of Sir Norman Lockyer have been exposed to severe, and, apparently, disintegrating criticism[631]. It is but fair to add that these rebutting arguments have been met by rejoinders, though of varying value. Do we urge that the theory, with the minute measurements which it involves, presupposes too high a state of culture for those early times, too deep a knowledge of astronomy, too complicated a system of religion or worship? We are met by the enunciation of another hypothesis, that the Druids of Caesar’s time, admittedly men of some learning, were the descendants of astronomer-priests of a more ancient British civilization[632].