CONTENTS 
Page 
ESA RINEP OER C LTRS 2. it 2 TUS EAL Ps kN hl ee Se tye ae aro Yay. 
iihevestablishmente sll: pos cfey sf tei pe Oe Bo ee aller a Bybee 1 
Sibprboardof Negentst i022 2 pe saws Lt tern 5- See Be eee ae 2 
Rinanees ee tee aed 2 Petey iP by PS Ae eee wt te ot 4 
Gem pnsoninn Mencegrial st. poet yi el ae Ce ee a te. tent EB eh 4 
asition ofthe Institutions after dL0OQ;years: 2.4. oeblle 1. eke boca 9 
mroaposcatnew, bindings 22 fiae tea ae, 2 yo es § fect oe A ee 2 
ianalwione DiclopicalwAres:.92 fol 2) Ai UE de et Ee Bee 13 
mourbeentu Arthur lecture.<2-2e Jos Sle ee oe 2 eee a 13 
Summary of the year’s activities of the branches of the Institution_______ 13 
SE arebiec sch AthEIS iy = see Moe Rt Pe aes Se ECHO ne Fos 18 
TOSS VRE yf = ee SR NSS oS A a ee 2 ey SS Si eye eed 19 
Appendix 1. Report on the United States National Museum____________ 21 
2. Report on the National Gallery of Art__....._.._....______- 35 
3. Report on the National Collection of Fine Arts____________ 53 
A .AReport on the freer Gallery ‘of Arteeu 22202 2 ee ee 59 
5. Report on the Bureau of American Ethnology _____________ 65 
6. Report on the International Exchange Service_____________ 77 
7. Report on the National Zoological Park_....__.___________ 85 
8. Report on the Astrophysical Observatory _________________ 113 
feReportionsthe librarysoi it |e pee ee ee ee 118 
404 Freportien pablicationels @esete oo) os. elo ee LS 123 
Report of the executive committee of the Board of Regents_____-_-_-_-- 129 
GENERAL APPENDIX 
On the astronomical dating of the earth’s crust, by Harlow Shapley__.____ 139 
Atomic power in the laboratory and in the stars, by Robert S. Richardson_ 151 
Atomic energy as a human asset, by Arthur H. Compton_______---_-___ 161 
The scientific importance of X-rays, by L. Henry Garland______-_____-_-_ aa 
Wasible-patterns of sound; by Ralph: K. Potter_...-....-..-..2--.--42.- 199 
Fluorine in United States water supplies—Pilot project for the Atlas of 
Diseases’. by ‘Anastasia’ VanvBurkalow_......22:2.2--l--b22k-2-.2-25 207 
The birth of Paricutin, by Jenaro Gonzalez R. and William F. Foshag-___ 223 
The natural history of whalebone whales, by N. A. Mackintosh __-__-__-___ 235 
Life history of the quetzal, by Alexander F. Skutch__________-__-___-_-- 265 
The sun and the harvest of the sea, by Waldo L. Schmitt_._____---_---- 295 
Anthropology and the melting pot, by T. D. Stewart___....__-_-------- 315 
Archeology of the Philippine Islands, by Olov R. T. Janse__.__--------- 345 
Palestinian pottery in Bible times, by J. L. Kelso and J. Palin Thorley_.__ 361 
he mareh of medicine, by M. M. Wintrobe:.....-...-...-..2.---s=.- 373 
mechinology and medicine. by Kurt's. Lions 2.2.2.2 l26 eee cen 401 
National responsibility for research, by J. E. Graf.__..._..__---------- 411 
Toward a new generation of scientists, by L. A. Hawkins_________-_---- 425 
