2l8 REPORT OF THE SECRETARY GENERAL, 



Engenharia sanitaria e ahastecimento municipal de agua, by Clodomiro 



Pereira da Silva. 

 Engineering work of the United States Reclamation Service, by Arthur 



Powell Davis. 

 Ingenieria Sanitaria. Saneamiento de poblaciones, by Carlos de Nar- 



vdez Q. 

 Irrigation and drainage, by F. H. Newell. 

 Laws and regulations regarding the use of water in Pan American countries, 



by Rome G. Brown. 

 Municipal water supplies, by George C. Whipple. 

 Reservoirs for municipal water supply, by Alfred D. Flinn. 

 Sewers, by H. de B. Parsons. 

 Street cleaning, by J. W. Paxton. 



The final disposition of city sewage, by Rudolph Hering. 

 The status of water power development, by H, W. Buck. 



SUBSECTION 5. 

 MECHANICAL ENGINEERING. 



Agricultural implements and machinery, by E. B. McCormick. 



Chronocyclegraph motion devices for measuring achievement, by Frank B. 

 Gilbreth and Lillian M. Gilbreth. 



Economy of steam power plants, by William Kent. 



The development of the park system of Washington, by Colonel Wm. W. 

 Harts. 



The gyroscope as applied to aerial and water navigation, by Elmer A. 

 Sperry. 



Transportadores aereos en el interior de los depdsitos del puerto de Monte- 

 video, by Eduardo Garcia de Zufiiga. 



SUBSECTION 6. 

 STANDARDS, SURVEYS, PARKS, BUILDINGS, NOMENCLATURE. 



Acceptance tests of electrical apparatus, by Clayton H. Sharp. 

 Engineering and other scientific work of the United States Coast and Geo. 



detic Survey, by E. Lester Jones. 

 Engineering work of the United States Geological Survey, by R. B. Marshall. 

 Metodo de notacion diagonal, by Rodolfo Aguilar Batres. 

 Tobias de coordenadas rectangulares para arcos sexagesimales y centesimales 



de diez en diez segundos, by Iberio San Romdn. 

 The work of the United Stales Bureau of Standards, by S. W. Stratton. 

 Una nueva propiedad involutiva de poligon-os afectos a una cdnica, by Jos6 



Isaac del Corral. 



