122 AXXUAL KEPORT SMITHSOlSriAN INSTITUTION, 1922. 



Racial groups and figures iu the Natural History Building of the United States 



National Museum, bj- Walter Hough, 

 Notes on the dances, music, and songs of the ancient and modern Mexicans, by 



Auguste Genin. 

 The Ralph Cross Johnson collection in the National Gallery at Washington, 



D. C, by George B. Rose. 



REPORT FOR 1921. 



The report of the executive committee and proceedings of the 

 Board of Eegents of the Institution, and the report of the secretary, 

 both forming part of the annual report of the Board of Eegents to 

 Congress, were issued in pamphlet form in November, 1921. 



Report of the executive committee and proceedings of the Board of Regents 

 of the Smithsonian Institution for the year ending June 30, 1921. 18 pp. 

 (Publ. 2660.) 



Report of the Secretary of the Smithsonian Institution for the year ending 

 June 30, 1921. 119 pp. (Publ. 2659.) 



The general appendix to this report, which was in press at the 

 close of the year, contains the following papers : 



The daily influence of astronomy, by W. W. Campbell. 



Cosmogony and stellar evolution, by J. H. Jeans. 



The diameters of the stars, by A. Danjon. 



Isotopes and atomic weights, by F. W. Aston. 



Modifying our ideas of nature : The Einstein theory of relativity, by Henry 



Norris Russell. 

 The alkali problem in irrigation, by Carl S. Scofield. 

 An outline of geophysical-chemical problems, by Robert B. Sosman. 

 The yielding of the earth's crust, by William Bowie. 

 The age of the earth, by the Right Hon. Lord Rayleigh, W. J. Sollas, J. W. 



Gregory, and Harold Jeffreys. 

 The department of geology of the U. S. National Museum, by George P. Merrill. 

 Some observations on the natural history of Costa Rica, by Robert Ridgway. 

 The historic development of the evolutionary idea, by Branislav Petronievics., 

 The heredity of acquired characters, by L. Cu^not. 



Breeding habits, development, and birth of the opossum, by Carl Hartman. 

 Some preliminary remarks on the velocity of migratory flight among birds, 



with special reference to the Palaearctic region, by R. Meinertzhagen. 

 A botanical reconnaissance in southeastern Asia, by A. S. Hitchcock. 

 Ant acacias and acacia ants of Mexico and Central America, by W. E. Safford. 

 The fall webworm, by R. E. Snodgrass. 

 Collecting insects on Mount Rainier, by A. L. Melander. 

 The science of man : Its needs and prospects, by Karl Pearson. 

 Pigmentation in the old Americans, with notes on graying and loss of hair, 



by Ale.s Hrdlicka. 

 Ancestor worship of the Hopi Indians, by J. Walter Fewkes. 

 The Indian in literature, by Herman F. C. Ten Kate. 

 Leopard-men in the Naga Hills, by J. H. Hutton. 

 A new era in Palestine exploration, by Elihu Grant. 

 The alimentary education of children, by Marcel Labb§. 

 A fifty-year sketch history of medical entomology, by L. O. Howard. 

 Laid and wove, by Dard Hunter. 

 Lead, by Carl W. Mitman. 

 William Crawford Gorgas, by Robert E, Noble. 



