The chief source is the memoir of Repossini, "Memoria sobre el rio Parana" (_Bol. Obras Publicas_, vol. vi, 1912, pp. 141-168 and 254-264, vol. vii, 1912, pp. 31-48 and 163-186, and vol. viii, 1913, pp. 33-99). It contains on a reduced scale the map issued by the Ministry of Public Works, which is not available in France. The defect is supplied by the English Admiralty Charts, "Rio de la Plata," 1869 (No. 2544 in the Catalogue of Admiralty Charts), and "River Parana," parts i, ii, iii, iv, v, and vi of 1905 (Nos. 1982/A and 1982/B). There is an interesting economic summary in W. S. Barclay, "The River Parana, an economic survey" (_Geogr. Journal_, xxxiii, 1909, pp. 1-10). On the estuary:-- Alej. Foster, "Regimen del Rio de la Plata y su correccion" (_An. Soc. Cient. Argent._, lii, 1901, pp. 209-234). G. Rovereto, "Studi di geomorfologia argentina," ii, "Il rio della Plata" (_Bol. Soc. Geol. Ital._, xxx, 1911). 12. POPULATION. Besides municipal and provincial censuses, there have been three general censuses: First census made in 1869, one folio volume published in 1872. I have only been able to consult _Oficina del Censo_. _Informe sobre la operacion y resultado del Primer censo argentino_ (Buenos Aires, 1870, octavo). Second census of the Argentine Republic, May 10, 1895 (2 vols, quarto, Buenos Aires, 1898). _Tercer Censo Nacional levantado el 1º de junio de 1914_ (10 vols, quarto, Buenos Aires, 1916-1917). Only the fifth volume, on agriculture, is not yet to hand. A geographical interpretation of the distribution of the population was attempted by E. A. S. Delachaux, "La poblacion de la Rep. Argent." (_Rev. Univ. Buenos Aires_, iii, 1905). INDEX Abipones, the, 24 _Acequia_, the, 45, 69, 83 Aconcagua, 19, 38, 59, 70, 71 Aeolian deposits, 21, 124, 170 Agricultural Centres Law, the, 202 _Aguadas_, 61, 210 _Algarrobas_, 39, 54, 64 Alhuampa, 113 Alumine, the, 128, 129 Ambrosetti, J. B., 136, 282 Ameghino, F., 168 Andalgala, 42 Andes, the Argentine, 19, 37, 46, 54, 57, 70, 126 Andes, the Patagonian, 19, 120, 126, 129 Anecon, 122, 151 Antofagasta, 54, 55 Apipe rapids, the, 239 Apostoles, 116 Araucanians, the, 24, 121 Argentine hydrographic service, 254 _Arrieros_, the, 51, 216, 217 Arroyo del Rey, 26 Asses, trade in, 53 Atamisqui, 97, 98 Atuel, the, 81, 84 Azcarate, 51, 52 Bahia Blanca, 25, 32, 148, 155, 164, 168, 173, 198, 223, 227, 271 Bajada Grande, the, 242, 243 Bamboo, 133 _Banados_, the, 62, 63, 67, 97, 98, 101 Barra del Indio, the, 253 Barrancas, 17, 245 Basalt, 122, 125, 149 Basques in Argentina, 183, 186 Bellavista, 246 Bellville, 167, 188 Bermejo, the, 40, 115 _Bodegueros_, 87-90 Bodenbender, G., 40, 57, 168, 286 Bolivia, relations with, 48, 50, 52, 53, 70 Boman, E., 47, 282 Brackebusch, L., 48, 54, 278, 282 Brazil, 109, 116, 182, 235 Breeding, 22, 131, 179, 188, 189