The forestry industry of the interior and that of the river-districts differ not only in the character of the workers, but in their organization and their market. The variety of red _quebracho_ which is exploited in the west is not quite the same as the variety that is found in the east. Each has a name of its own--_quebracho santiagueno_ and _quebracho chaqueno_. The former contains ten per cent. of tannin, the latter thirty per cent. The former is cut down for timber, the latter in order to extract the tannic acid. The one is sold in Argentina, and the other sent abroad. The working of the timber at Santiago has remained in the hands of a number of small capitalists and contractors who do not own the land and do not work there. They are content to buy in small amounts and according to the demand at the moment, the right to exploit the forests (_derecho de monte or derecho de lena_). The trunks of exceptionally large _quebracho_ provide logs that are sold by cubic measurement, but the district of the _quebracho santiagueno_ mainly exports sleepers. _Quebracho_ sleepers have been used in constructing the railways, both narrow and broad gauge, during the last twenty years on the Pampa. Tall and thin trees make telegraph posts; the smaller branches make stakes for wire fences. In parts of the bush where there is no red _quebracho_, the _retamo_ is used, to make posts for enclosures, and also the white _quebracho_, which is sold in round logs. Finally, the forests provide wood for fuel. The works at Tucuman, and the locomotives over a good part of the land, use wood-fuel. The wood of the red _quebracho_, if left for some years in the yards where the sleepers are made and is rid of the sap-wood, which rots and falls out--the _lena campana_--is excellent fuel. Charcoal is cheaper to transport than the wood, and can therefore be sent farther over the whole prairie district. It is made in the _monte_, along all the railways, and especially in the thinner forests on the edge of the prairie. The forestry of the interior is unstable as well as scattered and primitive. The equipment--saws that are easily taken down and set up--is not costly, and does not require much capital. When one canton of the forest has been exhausted, the saws are taken down and removed. The cuttings are not made in such a way as to allow the forest to recover, and so permit a continuous exploitation. Everything of any value is taken. The _quebracho_ is, moreover, a tree of slow growth. The forestry industry has at times returned, after an interval, to land that had been stripped, but that is not because they had planted a new generation of trees. It is because it became profitable, as the state of the market and the cost of transport changed, to cut down the small trees which had not been considered good enough on the earlier occasion.