We have also the testimony of man to the same fact, contemporary testimony inscribed on the granite. Herodotus tells us, that from the time of Mœris, the Egyptians had preserved an uninterrupted register of the annual risings of the Nile. This Mœris of the Greeks was Amenemha III., one of the last kings of the primæval monarchy, before the invasion of the Hyksos. This register was preserved both in a written record, in which the height of the inundation was given in figures for each year, (this is what Herodotus mentions,) and also in engraved markings on suitable river-side rocks. Of these markings, we, fortunately, have a series at Semnéh, in Nubia. Sesortesen II., the father of Amenemha III., had conquered Nubia. This event took place between two and three thousand years before our era. To secure his conquest, he built at Semnéh a strong castle on one of the perpendicular granite cliffs, between which the Nile had cut its channel. His son, not content with instituting the written register Herodotus mentions, ordered that the height of the inundation should, each year, be inscribed on the granite cliffs of Semnéh, which had been fortified by his father, and where an Egyptian garrison was kept. This castle, little injured by time, is still standing. Here was the most appropriate place for such a register. It was the actual bank of the river; it was perpendicular; it was indestructible; it measured all the water that came into Egypt. Amenemha must have been familiar with the place, for it was the custom of the princes to accompany the king in war. Now, there are thirteen of Amenemha’s inscriptions at this day on this cliff. Each gives a deeply-incised line for the height of the rising, and under it is an hieroglyphic inscription, informing us that that line indicates the height to which the river rose in such and such a year of Amenemha’s reign. In every instance the date is given. In the reign of Amenemha’s successor, the invasion of the Hyksos took place, terminated the old monarchy, and for four hundred years threw everything into confusion. But, what we are concerned with, is the fact that in the reign of this king and his successor, the Nile rose, on an average, twenty-four feet above the level to which it rises now. Here, then, are two witnesses, Nature and Man. The coincidence of their testimony is as clear and complete as it is undesigned. It may, therefore, be accepted as an undoubted fact, that the Nile is now flowing from Semnéh to Silsiléh at a level lower by at least twenty-four feet than it did at the date of the inscriptions. Nature says there was a time when it rose at least twenty-seven feet higher than at present, for at that height it deposited alluvium. There is no discrepancy in these three additional feet, though there would have been something like a discrepancy had Nature indicated three feet less than the markings.