REPORT OF THE SECRETARY 13 



engineer of Avionca, a subsidiary of the Pan-American Airways, 

 excavated pottery and portions of human skeletons. 



After some delay, Mr. Hershkovitz departed on January 3, 1942, 

 from Barranquilla for Caracolicito, arriving there January 4. On 

 invitation from the director, Sr. Jose I. Martinez, Mr. Hershkovitz 

 made collections in the tropical forests surrounding Colonia Agricola 

 de Caracolicito from January 9 to March 16. From this region he 

 moved camp to Pueblo Bello (Pueblo Viejo Sur) on the southern 

 flank of the Sierra Nevada de Santa Marta, Department of Magda- 

 lena, and worked there from April 19 to June 6. As a result of cen- 

 turies of deforesting, overgrazing, and burning by the Indians, the 

 general appearance of this region is now that of a savanna with 

 small stands of second-growth timber in the valleys and small patches 

 of virgin forest on the inaccessible parts of the hills. Consequently, 

 collecting did not produce as good results as had been anticipated. 

 About the middle of June, collecting was begun at El Salado, about 

 halfway between Pueblo Bello and Valencia. 



ELEVENTH ARTHUR LECTURE 



The late James Arthur, of New York, in 1931 bequeathed to the 

 Smithsonian Institution a sum of money, part of the income from 

 which should be used for an annual lecture on the sun. 



The eleventh Arthur lecture, under the title "The Sun and the 

 Earth's Magnetic Field," was given by John A. Fleming, director, 

 department of terrestrial magnetism, Carnegie Institution of Wash- 

 mgton, in the auditorium of the National Museum on February 26, 

 1942. The lecture is published in full in the General Appendix to this 

 Report. 



The 10 previous Arthur lectures have been as follows : 



1. The Composition of the Sun, by Henry Norris Russell, professor of as- 



tronomy at Princeton University. January 27, 1932. 



2. Gravitation in the Solar System, by Ernest William Brown, professor of 



mathematics at Yale University. January 25, 1933. 



3. Hov? the Sun Warms the Earth, by Charles G. Abbot, Secretary of the 



Smithsonian Institution. February 26, 1934. 



4. The Sun's Place among the Stars, by Walter S. Adams, director of the 



Mount Wilson Observatory. December 18, 1934. 



5. Sim Rays and Plant Life, by Earl S. Johnston, assistant director of the 



Division of Radiation and Organisms, Smithsonian Institution. February 

 25, 1930. 



6. Discoveries from Eclipse Expeditions, by Samuel Alfred Mitchell, director 



of the Leander McCormick Observatory, University of Virginia. February 

 9, 1937. 



7. The Sun and the Atmosphere, by Harlan True Stetson, research associate, 



Massachusetts Institute of Technology. February 24, 1938. 



8. Sun Worship, by Herbert J. Spinden, curator of American Indian Art and 



Primitive Cultures, Brooklyn Museums. February 21, 1939. 



