But its very growth has led to a gradual change in the part it plays in the interior of the country. In proportion as its population and wealth grew, it became a great national market. The products of the provinces go to it, not merely to meet its own needs as consumer, but in order to be distributed over the entire country. The figures of the cattle trade on the Buenos Aires market are instructive in this respect. From January to July 1919 there were 1,130,000 head of cattle sold, 240,000 being for the supply of the capital and 700,000 for the refrigerators.[147] Of the remainder, 120,000 were bought for fattening and 40,000 by the butchers of other towns. The capital of its own which has accumulated at Buenos Aires is invested either in real estate or in industry, which has found great profit both in the development of local consumption and in the great stock of labour provided by immigration. Buenos Aires is not now content to be merely an intermediary between the country and foreign lands. It contributes by its own resources and work to the task of colonization and the supply of manufactured articles to the agricultural and pastoral districts. It is, finally, a luxurious city, with every opportunity for the men who have grown rich by the rise in the price of lands to spend their income, and providing pleasure for the country folk who come up occasionally, tired of their laborious, rough and solitary existence. [147] During the same period the Argentinian refrigerators killed 1,490,000 head of cattle. Therefore, about half of these were bought at Buenos Aires. BIBLIOGRAPHY I give here only the most important and most recent works. A list of the articles I have consulted would be long and uninteresting, while a complete list of those which might have been consulted, and from which information might have been gleaned, is impossible. For a work of this character there is no account of travel, no study of the soil, the climate, or the vegetation, no statistical document or journal or purely historical text, that has not a perfect right to be regarded as a source. 1. PERIODICALS. Of the periodicals published in Argentina, and partly or wholly devoted to the study of the land and its development, the principal are:-- _Boletin del Instituto Geografico Argentino_ (Buenos Aires, since 1879; vol. i, 1879, vol. ii, 1881; one vol. yearly from 1881 to 1901; has appeared irregularly since). _Anales de la Sociedad Cientifica Argentina_ (Buenos Aires, 2 vols, yearly from 1876). _Revista de la Sociedad Geografica Argentina_ (Buenos Aires, only appeared from 1883 to 1889). _Boletin de la Academia Nacional de Ciencias de Cordoba_ (Cordoba, since 1874, 23 vols. to 1918). The publications of the Buenos Aires and La Plata museums also contain, besides copious anthropological, archaeological, palaeontological, and historical material, a large number of articles of interest to geographers:--