The principal rivers entering the Mediterranean directly are the Nile from Africa, and the Po, Rhone and Ebro from Europe.
Cold dry winds, often of great violence, occur in the Rhone valley (the Mistral), in Istria, and Dalmatia (the Bora), and in the western Caucasus.
The Am, the, Sane (which rises in the Faucilles and in the lower part of its course skirting the regions of Bresse and Dombes, receives the Doubs and joins the Rhone at Lyons), the Ardche and the Gard are the affluents on the right; on the left it is joined by the Arve, the Isre, the Drme and the Durance.
All these affluents are on the right, and with the exception of the Arige, which descends from the eastern Pyrcnees, rise in the mountaitis of Auvergne and the southern Cvennes, their sources often lying close to those of the rivers of the Loire and Rhone basins.
Examples of such bodies are the Society for Elementary Instruction the Polytechnic Association, the Philotechnic Association and the French Union of the Young at Paris; the Philomathic Society of Bordeaux; the Popular Education Society at Havre; the Rhone Society of Pro-, fessional Instruction at Lyons; the Industrial Society of Amiens and others.