Rubber contributed to the general total of exportation with 29.70 per cent in 1909, 39.06 per cent in 1910 and 22.53 per cent in 1911, or in other words an average of 30.43 per cent per annum. It is worthy of note, that the great difference which took place in the above-mentioned percentages is explained in the fluctuations in the prices of rubber, since the production not only did not decrease, but, as a matter of fact, increased from year to year. Therefore it is seen that nearly one-third of Brazil’s export trade is supplied by rubber, and it is nearly twenty millions of pounds sterling that Brazil receives every year, and which goes far to provide for the sustentation, not only of the population of the Brazilian Northwest, comprised in the great States of Pará, Amazons and Matto-Grosso and the Federal Territory of the Acre, but for the prosperity of the North-east States, which get the benefit of a good part of that sum through the intermedium of their sons, who live by the exploitation of the rubber; the Southern States benefit in their turn by the abundance of money in the North, that most secure guarantee of their prosperity, since that being producers of cereals, xarque, coffee, sugar, textile goods, hats and shoes, for a long time already they have constituted themselves the principal furnishers of food-stuffs and wearing apparel to that region. Finally there is still to be considered the benefit to be brought indirectly to the whole country because that sum goes to increase the commerce of importation, thus powerfully augmenting the Federal Customs Revenue. The sum obtained by the States of the Amazons and Pará and by the Federal Territory of the Acre, is also considerable every year by the tribute paid on the rubber going out. This last Territory of the Acre, since its incorporation with Brazil by the Treaty of Petropolis concluded with Bolivia in 1903, cost the Union (including the expenses incident to the acquisition of the Territory and other resulting compromises of the said treaty, such as the arbitral Tribunal, loans to Bolivia, marking out of the frontier, construction of the Madeira-Mamoré Railroad and expenses for the mobilization of troops, etc.), up till 1909 the sum of Rs. 62,595:562$038; the revenue brought in during the same period attained the sum of Rs. 58,052:757$012, in 1910 moreover the tax upon the rubber produced was Rs. 19,867:529$159 and in 1911 Rs. 9,671:711$068, or in other words Rs. 29,539:240$227 more, which should be carried to the credit of that very rich region. The rubber of the Acre is exported through the intermedium of the markets of Belém and Manáos, the impost-tax of 20 per cent ad valorem being collected on the occasion of its shipment.