provided most of its trade and for which it acted as intermediary with the Andean provinces. [143] Published by the _Revista del Instituto Paraguayo_ (vol. iv. p. 334). The great development of urban life in Argentina dates from the time of the colonization of the Pampean region. The ratio of the urban population has risen considerably during the last twenty-five years. In 1895, 113 centres with more than 2,000 inhabitants comprised 37 per cent. of the total population of Argentina; in 1914 the number of urban centres was 322, and they comprised 53 per cent. of the population. The population of towns with 5,000 to 20,000 inhabitants has increased threefold in twenty years, rising from 312,000 in 1895 to 977,000 in 1914. Large new towns like Rosario and Bahia Blanca were created. The relative sizes of the older towns changed rapidly. Tucuman and Mendoza (121,000 and 92,000 inhabitants) shot beyond Santiago and Salta (22,000 and 28,000 inhabitants). The towns of the north-west, Catamarca and Rioja, are, on the other hand, scarcely developed. When one examines a chart of the urban population of the Pampean region, one finds that colonization has led to the creation in it of ten chief centres, of from 15,000 to 25,000 inhabitants, and some fifty secondary centres, of from 5,000 to 12,000 inhabitants, which all have a distinctly urban character. This association of urban centres and a scattered agricultural or pastoral population is one of the original features of the way in which the Pampa was peopled. There is no village, or purely rural group. The distribution of these centres on the plain is fairly regular. They are a little closer together in the districts near the Parana, to the north of Buenos Aires, where the population is older, and where the density, even of the rural population, is at its highest. The territory of the Pampa is divided between the spheres of influence of these various centres. Their radius is as low as ten miles in the north-west, and is about twenty miles in the south of Buenos Aires and twenty-five in the extreme west. A secondary railway nucleus has generally settled the sites of them (San Francisco-Pergamino, Junin). Their population comprises all the workers needed for the flow of the economic life of the Pampa: agents for the exporters of cereals, merchants who supply the colonies with imported goods--especially agricultural machinery--bankers and insurance companies, surveyors and lawyers. Those which have the best service of trains have a certain amount of industry--mills and breweries--the products of which are absorbed locally. These towns derive all the elements of their life from the Pampean region itself, and have no direct relations either with foreign markets or with other parts of Argentina.[144]