The Dyardanes is less frequently mentioned, as it flows through the remotest parts of India. But it breeds not only crocodiles, like the Nile, but dolphins also, and various aquatic monsters unknown to other nations.[209] The Ethimanthus, which curves time after time in frequent maeanders, is used up for irrigation by the people on its banks. Hence it contributes to the sea but a small and nameless residue of its waters.[210] The country is everywhere intersected with many rivers besides these, but they are obscure, their course being too short to bring them into prominent notice. The maritime tracts, however, are most parched up by the north wind. This wind is prevented by the mountain-summits from penetrating to the interior parts, which for this reason are mild and nourish the crops.[211] But so completely has nature altered the regular changes of the season in these regions that, when other countries are basking under the hot rays of the sun, India is covered with snow; and on the other hand, when the world elsewhere is frost-bound, India is oppressed with intolerable heat. The reason why nature has thus inverted her order is not apparent; the sea, at any rate, by which India is washed does not differ in colour from other seas. It takes its name from King Erythrus, and hence ignorant people believe that its waters are red.[212] The soil produces flax from which the dress ordinarily worn by the natives is made.[213] The tender side of the barks of trees receives written characters like paper.[214] The birds can be readily trained to imitate the sounds of human speech.[215] The animals except those imported are unknown among other nations. The same country yields fit food for the rhinoceros, but this animal is not indigenous.[216] The elephants are more powerful than those tamed in Africa, and their size corresponds to their strength.[217] Gold is carried down by several rivers, whose loitering waters glide with slow and gentle currents.[218] The sea casts upon the shores precious stones and pearls, nor has anything contributed more to the opulence of the natives, especially since they spread the community of evil to foreign nations; for these offscourings of the boiling sea are valued at the price which fashion sets on coveted luxuries.[219]