198 REPORT OF THE SECRETARY GENERAL. 



Los trabajos geodisicos en el territorio argentino, by Benjamin Garcia 



Aparicio. 

 Meridian circle work at the La Plata Obersvatory, by Pablo T. Delavin 



and F^lix Aguilar. 

 Metodologia parcicU de ingenieria aplicada a la geodesia y topografia by 



Adrian Ruiz Moreno. 

 Progress of the work, optical and mechanical, on the 72-inch reflecting tele- 

 scope for the Canadian Observatory at Vancouver, by John A. Brashear. 

 Sintesis comparativa grdfico razonada de las leyes de perpetuidad de calen- 



darios actuales y proyectos de reforma, by Rodolfo Aguilar Batres. 

 Some indications of spiral motion in our stellar system, by C. D. Perrine. 

 Status of Magnetic Surveys in South America by the Carnegie Institution 



of Washington, by L. A. Bauer, 

 The astrographic catalogue for the zones, 17° to 2j°, assigned to the Chilean 



National Observatory, by Israael Gajardo Reyes. 

 Triangulacidn topogrdfica de la margen derecha de los rios Yaguaron, 



Yaguxiron Chico y Arroyo de la Mina, by Julio A. Roletti. 

 Stability of the new meridian circle of the Cordoba Observatory, by A. Estelle 



Glancy. 

 Work of Mount Wilson Solar Observatory, by F. H. Scares. 

 Work of observatory at La Plata, Argentine, by W. J. Hussey. 

 Work of the Lick Observatory: (a) A t Mount Hamilton, Col.; (6) In Chile, 



South America, by William Wallace Campbell. 



SUBSECTION 2. 

 MBTBOROLOGY AND SBISMOLOGY. 



Agricultural meteorology, by J. Warren Smith. 



A tmospheric-electric observations aboard the "Carnegie," by W. F. G. Swann. 



Callendar sunshine recorder and some of the world-wide problems to which 



this instrument can be applied, by A. E. Douglass. 

 Climatic control of cropping systems and farm operations, by J. F. Voorhees. 

 Contribucidn a la meteorologia colombiana, by Jorge Alvarez Heras. 

 Determinacion de la profundidad de la costra terrestre, by Galdino Negri. 

 El clima de Cuba, by Mariano Gutierrez Lanza, S. J. 

 Estado actual de la meteorologia y sismologia en Honduras, by Luis Landa. 

 Fluctuaciones climatoldgicas en los tiempos histdricos, by Antonio Ga- 



lan, S. J. 

 Fog forecasting in the United States, by H. C. Frankenfield. 

 Forecasts of river stages and floods in the Ohio Valley; their importance to 



commerce and in conserving life and property, by W. C. Devereaux. 



