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CONTENTS 



Page 



List of officials v 



The establishment 2 



The Board of Regents 2 



Appropriations 5 



Smithsonian Centennial 6 



Finances 6 



Trust Funds' employees included under Federal Retirement System 7 



Visitors 8 



Photographic Laboratory 8 



Buildings and equipment 9 



Appendix 1. Report on the United States National Museum 11 



2. Report on the National Gallery of Art 24 



3. Report on the National Collection of Fine Arts 38 



4. Report on the Freer Gallery of Art 45 



5. Report on the Bureau of American Ethnology 53 



6. Report on the International Exchange Service 83 



7. Report on the National Zoological Park 90 



8. Report on the Astrophysical Observatory 118 



9. Report on the National Air Museum 124 



10. Report on the Canal Zone Biological Area 126 



11. Report on the library 152 



12. Report on publications 156 



Report of the executive committee of the Board of Regents 162 



GENERAL APPENDIX 



Large sunspots, by Seth B. Nicholson 173 



Atomic energy, by A. E. Johns 177 



Telegraphy — pony express to beam radio, by George C. Hillis 191 



Plutonium and other transuranium elements, by Glenn T. Seaborg 207 



The use of isotopes as tracers, by A. H. W. Aten, Jr., and F. A. Heyn 217 



Silicones — a new continent in the world of chemistry, by S. L. Bass 229 



New products of the petroleum industry, by Hugh W. Field 235 



The tsunami of April 1, 1946, in the Hawaiian Islands, by G. A. Macdonald, 



F. P. Shepard, and D. C. Cox 257 



Drowned ancient islands of the Pacific basin, by H. H. Hess 281 



The biology of Bikini Atoll, with special reference to the fishes, by Leonard 



P. Schultz 301 



The senses of bats, by Brian Vesey-FitzGerald 317 



MoUusks and medicine in World War II, by R. Tucker Abbott 325 



ni 



