Art. 10. At sight of the documents spoken of in Art. 5, and after examining them, the claimant shall be entered ex-officio in the general register of farmers, existing in the General Directory of Agriculture with the advantages and guarantees it offers him. CHAPTER III The Experimental Stations for the culture of rubber Art. 11. The experimental stations for the culture of seringueira in the Territory of Acre and the States of Matto-Grosso, Amazonas, Pará, Maranhão, Piauhy and Bahia, and for the culture of maniçoba jointly with that of mangabeira, in the States of Piauhy, Ceará, Pernambuco, Bahia, Minas Geraes, S. Paulo, Goyaz, Paraná and Matto Grosso, have in view with the experimental study of all the factors relating to the regional culture of each of these trees, for the purpose of furnishing the cultivators with precise data for the adoption of methods and processes, which will make possible the economic and perfect production of their respective rubber. Art. 12. The experimental stations shall be established on lands that possess the following requisites: 1. Climatic situation and agricultural conditions required by the nature or quality of the plant to be cultivated. 2. The physical constitution and natural chemical composition which will permit conjunctly and parallel the culture of the principal food stuffs or plants of industrial utility. 3. Localization at points easily accessible by good roads so that they can be visited and verified, as well in the fields as in the books of registry of the farmers and agricultural accounts of the practical results and economies of the different services and operations. The existence of permanent water courses, or dams with sufficient capacity to guarantee irrigation when necessary, and also other agricultural services. Art. 13. The total area of each experimental station shall be from 80 to 100 hectares, so that there can be made at the same time in distinct partial areas the culture of the portions destined for experiments relative to each kind of tree and a demonstration of the normal systematic development of the respective culture, for comparison of the products and their revenue. Art. 14. In the area reserved for demonstration, there shall be included those which will serve as examples, being the first cultivated between the processes that shall have proven the most advantageous and which are sought to be introduced, and lastly of those generally adopted in that region. Art. 15. In each station there shall be reserved the land necessary for the establishment of a nursery of fruit trees and the production of selected seeds of alimentary plants or those of industrial utility, whose culture along with the principal plant shall be considered advantageous. Art. 16. Every experimental station shall have the following installations: 1. A physiological vegetable laboratory, the proving of seeds and phytopathology. 2. Laboratory of agricultural entomology.