Having uttered these objections, and having implied the necessity of slow-moving circumspection, one cannot think that the boundary of knowledge has yet been reached. Frequently, excavations reveal little more evidence than was already suspected after critical external examination. If then the archaeologist and the astronomer can find agreement in common premisses, the theodolite may indeed help the spade and atone for its limitations. While feeling persuaded that our megalithic monuments were never alined with such nicety that the orientation can be expressed in seconds, one can still understand that they may have been set out with greater accuracy than is commonly supposed. When we recollect, too, that many of our megaliths had at first probably a sepulchral purpose, we shall see no sufficient reason why they should not have been planned, at any rate, as skilfully as funeral earthworks. The Rev. J. Griffith, indeed, carries the orientation theory further, and applies it to primitive earthworks of a general character--those which are popularly known as camps and forts. Speaking of Burrington Camp, Somerset, he claims that its Southern bank is oriented to the equinox, and that another bank corresponds both to the sunset line at the summer solstice, and to sunrise at the winter solstice. He adds that the star alinement of this earthwork has been “worked out” by Sir Norman Lockyer to Arcturus. Castle Dyke, near Aysgarth, Yorkshire, gives indications of an alinement either to Alpha Centauri or to Capella[635]. These much-canvassed theories have led us away from our highroad, yet the digression was really slight, seeing that many of our megaliths mark the position of early burial-places. It is not asserted that all our ancient stone monuments are of this character, but some, at least, of those which are claimed as “temples,” were primarily graves; hence they come under our survey. Here, too, it seems fitting to notice another matter, dependent to some extent on the orientation of graves, and illustrative of the persistency of unconscious folk-memory.