These, with a number of artisans and handicraftsmen, formed the chief population of the towns; some of the money-dealers were very rich, and 36 per cent. per annum was not perhaps an extreme rate of interest. There were no silver or gold mines, external commerce hardly existed, and the money-price of commodities was low. The literary and polite language of Hindustan, called Urdu or Rekhta, was, and still is, so far common to the whole country, that it everywhere consists of a mixture of the same elements, though in varying proportions; and follows the same grammatical rules, though with different accents and idioms. The constituent parts are the Arabised Persian, and the Prakrit (in combination with a ruder basis, possibly of local origin), known as Hindi. Speaking loosely, the Persian speech has contributed nouns substantive of civilization, and adjectives of compliment or of science; while the verbs and ordinary vocables and particles pertaining to common life are derived from the earlier tongues. So, likewise, are the names of animals, excepting those of beasts of chase. The name Urdu, by which this language is usually known, is said to be of Turkish origin, and means literally "camp." But the Moghuls of India first introduced it in the precincts of the Imperial camp; so that as Urdu-i-muali (High or Supreme Camp) came to be a synonym for new Dehli after Shahjahan had made it his permanent capital, so Urdu-ki-zaban meant the lingua franca spoken at Dehli. It was the common method of communication between different classes, as English may have been in London under Edward III. The classical languages of Arabia and Persia were exclusively devoted to uses of law, learning, and religion; the Hindus cherished their Sanskrit and Hindi for their own purposes of business or worship, while the Emperor and his Moghul courtiers kept up their Turkish speech as a means of free intercourse in private life. The Chaghtai dialect resembled the Turkish still spoken in Kashgar. Out of such elements was the rich and still growing language of Hindustan formed, and it is yearly becoming more widely spread over the most remote parts of the country, being largely taught in Government schools, and used as a medium of translation from European literature, both by the English and by the natives. For this purpose it is peculiarly suited, from still possessing the power of assimilating foreign roots, instead of simply inserting them cut and dried, as is the case with languages that have reached maturity. Its own words are also liable to a kind of chemical change when encountering foreign matter (e.g., jau, barley: when oats were introduced some years ago, they were at once called jaui — "little barley").