6 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1951 



Table 1. — Visitors to the Sviithsonian buildings during the year ended June SO, 1951 



• Building closed September 6 through 28, 1950, during installation of the Bell X-1. 

 EIGHTEENTH ANNUAL JAMES ARTHUR LECTURE ON THE SUN 



In 1931 the Institution received a bequest from James Arthur, of 

 New York, a part of the income from which was to be used for an 

 annual lecture on some aspect of the study of the sun. 



The eighteenth Arthur lecture was delivered in the auditorium of 

 the Natural History Building on March 22, 1951, by Dr. Walter Orr 

 Roberts, astrophysicist and director of the High Altitude Observa- 

 tory, Boulder, Colo. The subject of Dr. Roberts's address was 

 "Stormy Weather on the Sun." This lecture is published in full in 

 the General Appendix of the present Report of the Board of Regents 

 (p. 163). 



OPENING OF ADAMS-CLEMENT COLLECTION 



Exercises were held in the Arts and Industries Building on the 

 afternoon of April 18, 1951, formally opening a collection of memo- 

 rabilia of the Adams family given to the Institution on June 1, 1950, 

 by Miss Mary Louisa Adams Clement, of Warrenton, Va., a descend- 

 ant through her mother of John Adams, second President of the 

 United States, and of John Quincy Adams, sixth President. The 

 collection contains nearly GOO heirlooms pertaining to the Adamses 

 and their descendants, including 15 portraits by Gilbert Stuart, Ed- 

 ward Dalton Marchand, Pieter van Huffel, Thomas H. Hull, Asher 

 B. Durand, John Trumbull, and other artists; a good representation 

 of period costumes and jewelry; china, glassware, and silver; books 

 and family letters; and numerous miscellaneous items. The gift is 



