The reasons for believing this are very good and plain. To this day the Mediterranean is a sea of evaporation. The rivers that flow into it do not make up for the evaporation from its surface. There is a constant current of water pouring into the Mediterranean from the Atlantic, and another current streaming in from the Bosphorus and Black Sea. For the Black Sea gets more water than it needs from the big rivers that flow into it; it is an overflowing sea, while the Mediterranean is a thirsty sea. From which it must be plain that when the Mediterranean was cut off both from the Atlantic Ocean and the Black Sea it must have been a shrinking sea with its waters sinking to a much lower level than those of the ocean outside. This is the case of the Caspian Sea to-day. Still more so is it the case with the Dead Sea. But if this reasoning is sound, then where to-day roll the blue waters of the Mediterranean there must once have been great areas of land, and land with a very agreeable climate. This was probably the case during the last Glacial Age, and we do not know how near it was to our time when the change occurred that brought back the ocean waters into the Mediterranean basin. Certainly there must have been Grimaldi people, and perhaps even Azilian and Neolithic people going about in the valleys and forests of these regions that are now submerged. The Neolithic Dark Whites, the people of the Mediterranean race, may have gone far towards the beginnings of settlement and civilization in that great lost Mediterranean Valley. Mr. W. B. Wright[61] gives us some very stimulating suggestions here. He suggests that in the Mediterranean basin there were two lakes, “one a fresh-water lake, in the eastern depression, which drained into the other in the western depression. It is interesting to think what must have happened when the ocean level rose once more as a result of the dissipation of the ice-sheets, and its waters began to pour over into the Mediterranean area. The inflow, small at first, must have ultimately increased to enormous dimensions, as the channel was slowly lowered by erosion and the ocean level slowly rose. If there were any unconsolidated materials on the sill of the Strait, the result must have been a genuine debacle, and if we consider the length of time which even an enormous torrent would take to fill such a basin as that of the Mediterranean, we must conclude that this result was likely to have been attained in any case. Now, this may seem all the wildest speculation, but it is not entirely so, for if we examine a submarine contour map of the Straits of Gibraltar, we find there is an enormous valley running up from the Mediterranean deep, right through the Straits, and trenching some distance out on to the Atlantic shelf. This valley or gorge is probably the work of the inflowing waters of the ocean at the termination of the period of interior drainage.”