2l6 REPORT OF THE SECRETARY GENERAL. 



Conveniencia y posibilidad de establecer en Pan America y especialmenie 



en Centra y Sud America un sistem^ jerroviario con trocha uniforms, 



by Carlos Tejada Sorzano. 

 Cudl es la trocha que mas conviene a nuesira red ferrea, by Santiago Marin 



Vicuna. 

 Discusion sintetica del trazado del eje hidrdulico, by Ram6n Salas Edwards, 

 El esttuirio del Plata, by Francisco P. Miranda. 

 Employment and behavior of concrete and reinforced concrete in fresh and 



saline waters under the servitude of waves in exposed situations, by 



Chandler Davis. 

 Engineering and scientific work of the United States Office of Public Roads 



and Rural Engineering, by L. W. Page. 

 Estudio general de la construccidn y conservacidn de carreteras y calles. — 



Estudio de una calzada automoviliaria, by A. Manrique Martin. 

 Harbor and port terminal facilities and works, by H. McL. Harding. 

 Ingenieria general en Colombia, by Paulo Pinz6n. 

 Long-span bridges in America, by Henry S. Jacoby. 

 Mejora en el Rio Magdalena, by Miguel Triana. 

 New York State canals, by William B. Landreth. 

 Notas sobre vias de comunicacidn en la Republica del Ecuudor, by Francisco 



Manrique. 

 Obras de desagiie de la regidn sur de la Provincia de Buenos Aires, by 



Agustin Mercau. 

 Observaciones generates sobre el regimen de los cursos de agua en la Repu- 

 blica O. del Uruguay, desde el punto de vista de la construccidn de 



puentes. — Solu^iones adoptadas, by Federico E. Capurro. 

 Public roads in the United States, by J. E. Pennybacker. 

 Sandy seacoast shore protection, by B. F. Cresson, jr. 

 SituxiQao e desenvolvimento de vias ferro-viarias de trans parte pelas montanhas, 



by Clodomiro Pereira da Silva. 

 Soils in relation to allowable pressures thereon, by Robert A. Cummings. . 

 The best type of construction for piers and quays in water fronts of great 



depths and swift currents, by J. F. Coleman. 

 The work of the Corps of Engineers, United States Army, by Lieut. Col. E. 



Eveleth Winslow. 

 Trabajos hidrogrdficos en el Rio de La Plata. Nuevos aparatos, by Agustin 



Mercau. 

 Uniform gauge for railways, by Fred Lavis. 

 Vertical lift bridges, by J. A. L. Waddell. 



