Corrientes also has its forests, and in these we find most of the species of the forests of the Chaco, in straight lines, along the water-courses, and in somewhat larger patches on the tablelands which separate the lower valleys near the Parana. They at first supplied the Curupai bark which was used in the Corrientes tanneries. The yards for the construction of river-boats emigrated from Paraguay to Corrientes at the beginning of the nineteenth century, at the same time and for the same reasons as the tobacco trade. The exploiting of the red _quebracho_ did not begin until about 1850. In 1887 Virasoro relates that fifty ships are engaged in loading with Nandubai timber on the banks of the Rio Corrientes and transporting it to Rosario.[46] Born on the left bank of the Parana, the forestry industry emigrated toward the end of the century to the right bank, whither the workers of Corrientes followed it. [46] Val. Virasoro, "Los esteros y lagunas del Ibera" in _Bol. Instit. Geog. Argent._ (vi. 1887; pp. 305-31). We find the same movement further north, on the Paraguay. The exploitation of the woods is in that case a very old industry on the tributaries of the left bank. D'Azara draws attention to its importance.[47] Robertson found, when he went from Corrientes to Asuncion in 1814, a population of wood-cutters in the marshy belt near the river. During floods they took refuge in the agricultural cantons of the frontier on high ground, where they were well received. It seems, then, that wood-cutting was already a seasonal industry at this time. The exploitation of the forests is now rapidly invading the right bank, which was long abandoned to the wild Indians. [47] _Diario de la navegacion y reconocimiento del Rio Tibicuari_ (Coll. de Angelis, vol. ii.). * * * * * The Santiaguenos and Correntinos do not mix. The two zones of expansion and of forestry, of which they are the pioneers, are independent of each other. The _quechua_, which is the language of the _banados_ of the Rio Dulce, is spoken in the timber-yards of the Chaco de Santiago; the _guarani_, the language of Corrientes and the Paraguay, is most common along the river, in the Chaco de Santa Fe. Their respective spheres will not come into touch with each other until the Quimili branch of the Central Norte Railway, which comes from the Santiago province, joins the line of penetration at Resistencia, on the Parana, in the west.