of manicoba jointly with that of mangabeira, in the States of 
Piauhy, Ceara, Parnambuco, Bahia, Minas Geraes, S. Paulo, 
Goyaz, Parana and Matto Grosso, have in view with the experi- 
mental 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 composi- 
tion 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 neces- 
sary, and also other agricultural services. 
Art. 18. 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 re- 
spective 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 follow- 
ing installations: 
1. A physiological vegetable laboratory, the proving of seeds 
and phytopathology. 
2. Laboratory of agricultural entomology. 
3. Laboratory of argicultural, vegetable and bromatological 
chemistry. 
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