24. If however after I have found fault with the opinions proposed, I am bound to declare an opinion of my own about the matters which are in doubt, I will tell what to my mind is the reason why the Nile increases in the summer. In the winter season the Sun, being driven away from his former path through the heaven265 by the stormy winds, comes to the upper parts of Libya. If one would set forth the matter in the shortest way, all has now been said; for whatever region this god approaches most and stands directly above, this it may reasonably be supposed is most in want of water, and its native streams of rivers are dried up most. 25. However, to set it forth at greater length, thus it is:—the Sun passing in his course by the upper parts of Libya, does thus, that is to say, since at all times the air in those parts is clear and the country is warm, because there are no cold winds,266 in passing through it the Sun does just as he was wont to do in the summer, when going through the midst of the heaven, that is he draws to himself the water, and having drawn it he drives it away to the upper parts of the country, and the winds take it up and scattering it abroad melt it into rain; so it is natural that the winds which blow from this region, namely the South and Southwest Winds, should be much the most rainy of all the winds. I think however that the Sun does not send away from himself all the water of the Nile of each year, but that he also lets some remain behind with himself. Then when the winter becomes milder, the Sun returns back again to the midst of the heaven, and from that time onwards he draws equally from all rivers; but in the meanwhile they flow in large volume, since water of rain mingles with them in great quantity, because their country receives rain then and is filled with torrent streams. In summer however they are weak, since not only the showers of rain fail then, but also they are drawn by the Sun. The Nile however, alone of all rivers, not having rain and being drawn by the Sun, naturally flows during this time of winter in much less than its proper volume, that is much less than in summer;267 for then it is drawn equally with all the other waters, but in winter it bears the burden alone. Thus I suppose the Sun to be the cause of these things. 26. He is also the cause in my opinion that the air in these parts is dry, since he makes it so by scorching up his path through the heaven:268 thus summer prevails always in the upper parts of Libya. If however the station of the seasons had been changed, and where now in the heaven are placed the North Wind and winter, there was the station of the South Wind and of the midday, and where now is placed the South Wind, there was the North, if this had been so, the Sun being driven from the midst of the heaven by the winter and the North Wind would go to the upper parts of Europe, just as now he comes to the upper parts of Libya, and passing in his course throughout the whole of Europe I suppose that he would do to the Ister that which he now works upon the Nile. 27. As to the breeze, why none blows from the river, my opinion is that from very hot places it is not natural that anything should blow, and that a breeze is wont to blow from something cold.
28. Let these matters then be as they are and as they were at the first: but as to the sources of the Nile, not one either of the Egyptians or of the Libyans or of the Hellenes, who came to speech with me, professed to know anything, except the scribe of the sacred treasury of Athene at the city of Saïs in Egypt. To me however this man seemed not to be speaking seriously when he said that he had certain knowledge of it; and he said as follows, namely that there were two mountains of which the tops ran up to a sharp point, situated between the city of Syene, which is in the district of Thebes, and Elephantine, and the names of the mountains were, of the one Crophi and of the other Mophi. From the middle between these two mountains flowed (he said) the sources of the Nile, which were fathomless in depth, and half of the water flowed to Egypt and towards the North Wind, the other half to Ethiopia and the South Wind. As for the fathomless depth of the source, he said that Psammetichos king of Egypt came to a trial of this matter; for he had a rope twisted of many
