CONTENTS 



Page 



List of officials v 



General statement 1 



The Establishment 3 



The Board of Regents 3 



Finances 4 



Appropriations 5 



Visitors 5 



Eighteenth annual James Arthur lecture on the sun 6 



Opening of Adams-Clement collection 6 



Memorial. gifts 7 



Summary of the year's activities of the branches of the Institution 7 



Publications 11 



Library 12 



Appendix 1. Report on the United States National Museum 14 



2. Report on the National Gallery of Art 25 



3. Report on the National Collection of Fine Arts 41 



4. Report on the Freer Gallery of Art 49 



5. Report on the Bureau of American Ethnology 56 



6. Report on the International Exchange Service 96 



7. Report on the National Zoological Park 104 



8. Report on the Astrophysical Observatory 117 



9. Report on the National Air Museum 123 



10. Report on the Canal Zone Biological Area 134 



11. Report on the library 144 



12. Report on publications 148 



Report of the executive committee of the Board of Regents 154 



GENERAL APPENDIX 



Stormy weather on the sun, by Walter Orr Roberts 163 



An appraisal of cloud seeding as a means of increasing precipitation, by 



Henry G. Houghton 175 



On Einstein's new theory, bj' Leopold Infeld 189 



Some results in the field of high-pressure phj'sics, by P. W. Bridgman 199 



Ultrasonics, bj' Arthur R. Laufer 213 



The industrial applications of atomic energy, by M. L. Oliphant 223 



Some prospects in the field of electronics, by V. K. Zworykin 235 



The new chemical elements, by Saul Dushman 245 



The insides of metals, by Carl A. Zapff e 253 



Atomic weapons against cancer, by E. N. Lockard 263 



Enzymes: Machine tools of the cellular factory, by B. A. Kilby 273 



The fauna of America, by Austin H. Clark 287 



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