CONTENTS 



Page 



List of officials xi 



Outstanding events 1 



Summary of the year's activities of the branches of the Institution 2 



The establishment 5 



The Board of Regents 5 



Finances 7 



Matters of general interest 7 



Centenary of the birth of Samuel Pierpont Langley 7 



Award of Langley medal to Joseph S. Ames 8 



Walter Rathbone Bacon traveling scholarship 8 



Fourth Arthur Lecture 9 



Smithsonian Institution Exhibit at the California Pacific Interna- 

 tional Exposition, 1935 9 



Explorations and field work 10 



Publications 12 



Library 12 



Appendix 1. Report on the United States National Museum 13 



2. Report on the National Gallery of Art 20 



3. Report on the Freer Gallery of Art 27 



4. Report on the Bureau of American Ethnology 31 



5. Report on the International Exchange Service 39 



6. Report on the National Zoological Park 48 



7. Report on the Astrophysical Observatory 57 



8. Report on the Division of Radiation and Organisms 62 



9. Report on the library 64 



10. Report on publications 74 



Report of the executive committee of the Board of Regents 81 



GENERAL APPENDIX 



Weather governed by changes in the sun's radiation, by C. G. Abbot 93 



Seasonal weather and its prediction, by Sir Gilbert T. Walker 117 



The sun's place among the stars, by Walter S. Adams 139 



The atmospheres of the planets, by Henry Norris Russell 153 



The surface features of the moon, by F. E. Wright 169 



The upper atmosphere, by G. M. B. Dobson, D. Sc, F. R. S 183 



The nature of the cosmic radiation, by Thomas H. Johnson 197 



What is electricity? by Paul R. Heyl 215 



New facts about the nucleus of the atom, by Carl D. Anderson 235 



The approach to the absolute zero of temperature, by F. Simon, D. Phil.. 249 

 The discovery and significance of vitamins, by Sir Frederick Gowland 



Hopkins, P. R. S 265 



The salinity of irrigation water, by Carl S. Scofield 275 



Selenium absorption by plants and their resulting toxicity to animals, by 



Annie M. Hurd-Karrer 289 



V 



