(a) Exemption from all import duties, including fees, in the form and by the process referred to in article 91, for all the imported material necessary to complete the equipment of the plantations, including houses, barns, pastures, fences, reservoirs, implements and machines for the culture, harvesting and treating the cereals, installation of mills and factories, improved cattle, seeds of alimentary and industrial plants, as well as for the materials and chemicals necessary to maintain the factories and husbandry, during the time of his contract. (b) Right of condemnation for public use, of the property or improvements of individuals, which may be necessary, in the opinion of the Government for any of the services of the enterprise. (c) All the favors specified in articles 131 and 132 of decree number 9,081, Nov. 3, 1911, native and foreign colonies being made equal. (d) Preference for the contract of the works necessary for the improvement of the navigation of the Rio Branco, if the price is considered acceptable by the Government and the time for the completion of the work not more than 6 years. Art. 77. The term of the lease in the contract shall be 60 years, at the end of which all the cattle for breeding and all the improvements then possessed by the lessee shall revert to the dominion of the Union. Art. 78. Within the term of 1 year, to date from the signing of the contract, the Government will give to lessee a copy of the plans of the plantations, in which shall be marked the water courses with a specification of those navigable, the zone of forest and plain and the situations of the occupants who may be found. Art. 79. The plantations shall be turned over as soon as an inventory of the improvements, and the number of cattle of each kind then on the plantation can be made. CHAPTER II The colonization of the plantation of S. Marcos situated between the Rivers Mahú, Takutú, Surumú and Cotingo Art. 80. The colonization of the lands of S. Marcos’ plantation, situated between the Rivers Mahú, Takutú, Surumú and Cotingo, on the frontier of British Guiana shall be done directly by the Minister of Agriculture, who shall order, without delay, to prepare a plan with the necessary details, and afterwards carry them out as they may be necessary: (a) A town of the aborigines; (b) An agricultural centre; (c) A colonial nucleus; (d) An ambulant course of agriculture; (e) An agricultural apprenticeship; (f) A school of practical agriculture; (g) An experimental station. Art. 81. The colonization of the lands whether in the agricultural centre, or colonial nucleus, shall be made so that each lot occupied by a foreign colonist corresponds to at least two occupied by families of native colonists, which preferably shall be chosen from those who arrive at the lodges of Belém and Manáos, proceeding from the states of the northwest.