Minister of Transportation and Public Works and shall be 
obliged to enlarge their gauge to 1 meter, without other favors 
from the Government, there not being a supplementary term 
of the contract, if it is wanting for its termination in less than 
60 years, when the gross receipts have reached 15,000 mibreis 
per kilometer during 3 successive years. Before this the rail- 
road may pass to the Minister of Tranportation and the gauge 
be widened, on his own account, when he shall think it to his 
interest, or by a new contract, when the Government thinks it 
necessary to have it done for the necessities of the administra- 
tion or the defense of the country. 
Art. 55. In addition to the subvention per kilometer, there 
shall be given to these railroads all the indirect favors received 
by the other railroads of the country. 
Art. 56. The maximum term for a concession shall be 90 
years, at the end of which the railroad will revert to the control 
of the Union. 
Art. 5%. Under the right of experiment, the Government 
shall promote at once the following lines of economical rail- 
roads: 
1. Parting from “Autiga Souzel,”’ or other point more con- 
venient on the left bank of the Xingu and ascending the left 
side of the valley to the margin of the River Cariahy, with a 
branch which parting at a convenient point, shall go to the 
Tapajoz and ascend the right hand side of the valley until it 
reaches the S. Manoel which may appear advantageous, ascend- 
ing the secondary valley and continuing to the dividing of the 
waters of the two principal rivers. 
2. Parting from the confluence of the River Negro with the 
Branco and by the valley of the River Seruiny, gaining the right 
side of the valley by the Caratimani river and continuing to the 
upper Uraricaera, with a branch parting at a convenient point 
at the request of the upper Paduiry and a branch in the direc- 
tion of the Villa Boa Vista. 
CHAPTER Il 
Improvements for the navigation of the Rivers Branco, Negro, 
Purus and Acre 
Art. 58. The improvements necessary for effective naviga- 
tion at any season of the year, for steamers drawing 3 feet, on 
the River Negro, between Santa Izabel and Cucuhy, on the 
River Branco, from its mouth to Sao Joaquin, on the River 
Purtts, between Hyutanhaé and Senna Madureira, and on the 
River Acre, from its mouth to Riosinho de Pedros, shall be con- 
tracted for by public bidding, or independently of bidding, with 
86 : 
