CONTENTS 
Page 
Mii GeO bro LC ras tym nent Wings 4 Slvr els SE Aer hl en Sl cA ofS v 
Generalstatement see = eeunke so Se eet Bo 3 Be ee Lt) 1 
Presentation of the Wright Brothers’ Aeroplane of 1903 to the United 
Statese Nationale Muse wit 2) 52 toe 2 oe eae eee ee ee Be ee 3 
The establishment. ____..__-- ie kD Bay aioe ahd Leer ee aie alee ae SS a ao 5 
Fiber BOasrdkotpecentcaa== pe tnt a5 as aie eee Bee a ee ey eee eee 6 
PSSITY ATR COS eee ss AS Lh ay SR A 6 teen eoiiens =  n a s ne  e U 
IND PLOPMAt ONS = aes execs Soe Pee ae ee eee ee 7 
WASILODS tet eps. aps BL win a hal ue Peres SH hen Re nt UO ET OE BA 8 
Sixteenth James Arthur annual lecture on the sun___.___.___________-- 8 
Summary of the year’s activities of the branches of the Institution_______ 9 
Publications. = 222s 252s=22< fel 8a README eo AOE TY Li elt OL ICRRMS Shee Oe | SLES 14 
ALS Altay see ol lan rs ein 1s Rs apres a ae OE aks 2 DAA septs SRE Lhd 15 
Appendix 1. Report on the United States National Museum____________ 16 
2. Report on the National Gallery of Arti! (22 20) 2S 2 25 
3. Report on the National Collection of Fine Arts___________- 41 
4 Reportontthesreem Gallery of Artes = sees ee ee eee 47 
5. Report on the Bureau of American Ethnology____________- 55 
6. Report on the International Exchange Service___________-_- 89 
7. Report on the National Zoological Park_-_-______-______-- 97 
8. Report on the Astrophysical Observatory ---____________-- 109 
9: Report on-the National Air Museumis22-2 2222-25252 -_ === 114 
10. Report on the Canal Zone Biological Area__--____________- 126 
ileReport, onyiheslibrarys=22 == 720 shoe ea eee eae 132 
25 Repongion pPublcabiong==2 263.993 2225s. - ose ode eee 136 
Report of the executive committee of the Board of Regents________-____- 143 
GENERAL APPENDIX 
hestormavionsolestarsbyaliyInanyoDILZCl dae ae eee 153 
Aloe Cream OI ToS Capel, loyy ANoveriao leRVE ee eee enneeeoe 161 
The 200-inch Hale telescope and some problems it may solve, by Edwin 
Pole eas ee eee eye oe ee ee ee eye Ae ake 3 175 
The determination of precise time, by Sir Harold Spencer Jones________- 189 
The elementary particles of physics, by Carl D. Anderson_____-_____--- 203 
Recent advances in virus research, by Wendell M. Stanley___-__-___--_-- 213 
Ground-water investigations in the United States, by A. N. Sayre____--- 219 
Modern soil science, by Charles E. Kellogg_.____._._-...---------------- 227 
Aime in-ovolution bys EeZeUnere cejsee= oss se- Sao ao cal ee cess 247 
More about animal behavior, by Ernest P. Walker___-__________------- 261 
