I may here remark that, so far as I know, Edfû is the temple in Egypt nearest the meridian. If, therefore, it were used as, on my theory, all other temples were, it could only have picked up the light from each of the southerly stars, as by the precessional movements they were brought into visibility very near the southern horizon. In this respect, then, it is truly a temple of Horns, in relation to the southern stars--the southern eyes of Horus. But it was not a sun-temple in the sense that Karnak was one; and if ceremonies were performed for which light was required, perhaps the apparatus referred to by the writer Dupuis[48] was utilised. He mentions that in a temple at Heliopolis--whether a solar temple or not is not stated--the temple was flooded all day long with sunlight by means of a mirror. I do not know the authorities on which Dupuis founds his statement, but I have no doubt that it is amply justified, for the reason that doubtless all the inscriptions in the deepest tombs were made by means of reflected sunlight, for in all freshly-opened tombs there are no traces whatever of any kind of combustion having taken place, even in the inner-most recesses. So strikingly evident is this that my friend M. Bouriant, while we were discussing this matter at Thebes, laughingly suggested the possibility that the electric light was known to the ancient Egyptians. With a system of fixed mirrors inside the galleries, whatever their length, and a movable mirror outside to follow the course of an Egyptian sun and reflect its beams inside, it would be possible to keep up a constant illumination in any part of the galleries, however remote. Dupuis quotes another statement that the greatest precautions were taken that the first rays of sunlight should enter a temple (of course, he means a solar temple). But it is possible that there might have been another temple at right angles, facing nearly due east. In this case, the larger temple would have been named after the worship to which the smaller one was dedicated. If so, unlike the solar temples at Heliopolis, Abydos, and Thebes, the Edfû temple was sacred to the Equinoctial Sun, or, at all events, to the Sun very near an equinox. CHAPTER XVIII. THE STAR-TEMPLES AT KARNAK.