138 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1949 
The general appendix contained the following papers (Publs. 3922- 
3939): 
Large sunspots, by Seth B. Nicholson. 
Atomic energy, by A. E. Johns. 
Telegraphy—pony express to beam radio, by George C. Hillis. 
Plutonium and otber transuranium clements, by Glenn T. Seaborg. 
The use of isotopes as tracers, by A. H. W. Aten, Jr., and F. A. Heyn. 
Silicones—a new Continent in the world of chemistry, by S. L. Bass. 
New products of the petroleum industry, by Hugh W. Field. 
The tsunami of April 1, 1946, in the Hawaiian Islands, by G. A. Macdonald, 
F. P. Shepard, and E. C. Cox. 
Drowned ancient islands of the Pacific basin, by H. H. Hess. 
The biology of Bikini Atoll, with special reference to the fishes, by Leonard P. 
Schultz. 
‘The senses of bats, by Brian Vesey-FitzGerald 
Mollusks and medicine in World War II, by R. Tucker Abbott. 
Some remarks on the influence of insects on human welfare, by Carl D. Duncan. 
Mosquito contro! tests from the Arctic to the Tropics, by H. H. Stage. 
The primary centers of civilization, by John R. Swanton. 
The Ryukyu people: A cultural appraisal, by Marshall T. Newman and Ransom 
L. Eng. 
Puzzle in Panama, by Waldo G. Bowman. 
Comparison of propeller and reaction-propelled airplane performances, by Benson 
Hamlin and F. Spenceley. 
Report for 1948.—The Report of the Secretary, which included the 
financial report of the executive committee of the Board of Regents, 
and which will form part of the Annual Report of the Board of Regents 
to Congress, was issued January 13, 1949: 
Report of the Secretary of the Smithsonian Institution and financial report of 
the executive committee of the Board of Regents for the year ended June 30, 1948. 
ix+158 pp., 4 pls., 1 chart. (Publ. 3952.) 1948. 
The Report volume for 1948, containing the general appendix, was 
in press at the close of the year. 
SPECIAL PUBLICATIONS 
National Aircraft Collection, by Paul Edward Garber. Eighth edition. 44 
pp., illus. (Publ. 3979.) May 2, 1949. 
The following special publication was reprinted: 
Brief Guide to the Smithsonian Institution. Seventh edition. 80 pp., illus. 
Dec. 13, 1948. 
PUBLICATIONS OF THE UNITED STATES NATIONAL MUSEUM 
The editorial work of the National Museum has continued during 
the year under the immediate direction of the editor, Paul H. Oehser. 
There were issued 1 Annual Report, 25 Proceedings papers, 3 Bulletins, 
