In the central region we also find the mandarin or tangerine (in the north of Entre Rios and Santa Fé), lemons (in Entre Rios, Santa Fé, and Buenos Ayres), the grape-vine, especially in Mendoza and San Juan, and also in La Rioja, Salta, Catamarca, Córdoba, Santa Fé, Entre Rios, and Buenos Ayres. Peaches, prunes, apricots, cherries, apples, pears, quinces, medlars, and figs are grown in all these districts, and chiefly in the Province of Buenos Ayres, and the islands of the delta of the Parana. In the same region we also find almonds, walnuts, hazel-nuts, and chestnuts, but grown on a small scale only. There is a fair production of lemons; and the olive grows well under favourable conditions. In the southern region there is no fruit grown, except on a few estates in the Rio Negro and in the valley of Chubut. Yet peaches, apricots, prunes, cherries, apples, and pears will flourish in certain localities; while walnuts, filberts and chestnuts might be grown on an enormous scale on the Andean slopes, where the rains are more frequent and the atmosphere more humid. Up to the present time, on account of the large profits made by those engaged in agriculture and stock-raising, and above all on account of the insufficiency of the population, which is the prime cause of which we have already spoken, the industry of fruit-farming has been practically ignored, and what little has been undertaken has followed no definite plan, such as the careful selection of stocks and slips and saplings, the preparation of the soil, and the efficient protection of the trees. But in spite of all, very satisfactory results have been obtained, which have revealed the fertility of the soil and the excellence of the climate. But quite lately we have seen a remarkable development in this branch of agriculture, which seems to promise a fruit-growing industry comparable to that of other and more advanced countries than the Argentine. To-day, according to Girola,[73] more care is expended upon the planting and cultivation of the trees, as the growers have acquired the conviction that it is better to produce quality rather than quantity, and that fruit-growing demands, like other departments of agriculture, the careful selection of varieties at the time of planting; as well as incessant improvement by means of careful grafting, and the application of special procedures to the elimination of noxious insects, and the prevention of parasitic or other maladies. [Footnote 73: See the chapter _Arbres Fruitiers_ in the _Investigation agricole_, by C. P. Girola, reproduced in the _Annales de la Société Rurale Argentine_ for January-February 1905.]