118 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1925 



The arc-hitecturc of atoms and a universe built of atoms, by C. G. Abbot. 



Aeronautic researcli, by Josepli S. Ames. 



Photosyutliesis and the possible use of solar energy, by H. A. Spoebr. 



Fogs and clouds, by W. J. Humphreys. 



Some aspects of the use of the annual rings of trees in climatic study, by 

 Prof. A. E. Douglass. 



The age of the earth, by T. C. Chamberlin and others. 



How deep is the ocean? by C. G. Abbot. 



Two decades of genetic progress, by E. M. East. 



Observations on a Montana beaver canal, by S. Stillman Berry. 



The Republic of Salvador, by Paul C Standley. 



The tent caten>illftr, by R. E. Snodgra.ss. 



The life history and habits of the solitary wasp, Philanthus gibhosus, by Ed- 

 ward G. Reinhard. 



The use of idols in Hopi wor.ship, by J. Walter Fewkes. 



Two Chaco Canyon pit houses, by Neil M. Judd. 



Cwllections of Old World archoolojry in the United States National Museum, 

 by I. M. Casanowicz. 



The " Shake Religion " of Pugot Sound, by T. T. Waterman. 



Excavations at Askalon, by Prof. J. Garstang. 



National efforts at home making, by F. H. Newell. 



Ideals of the telephone service, by John J. Carty. 



Report for 19^3. — The complete volume of the Report of the 

 Board of Regents for 1923 was receiAed from the Public Printer in 

 June, 1925. 



Annual Report of the Board of Regents of the Smithsonian Institution, 

 showing operations, expenditures, and condition of the Institution for the 

 year ending June 30, 1!)23. xii-f578 pp., 100 pis., 72 text flgxires. (Publ. 



2758.) 



The appendix cojilainod the following papers: 



The constitution and (solution of the stars, by Henry Norris Russell. 



The sun and sunspots, 1820-1920, by E. Walter Maunder. 



Joining the electric wave and heat wave si>ectra, by E. F. Nichols and J. D. 



Tear. 

 The possibilities of instrumental development, by George E. Hale. 

 The borderland of astronomy and geology, by Prof. A. S. Eddington. 

 Atmospheric nitrogen fixation, by Eric A. Lof. 

 The place of proteins in the diet in the light of the newer knowledge of nutri 



tion, by H. H. Mitchell. 

 The story of the production and uses of ductile tantalum, by Clarence W. 



Balke. 

 The composition of the earth's interior, by L. H. Adams and N. L. Williamson. 

 Diamond-bearing peridotite in Pike County, Ark., by H. D. Miser and C. S 



Ross. 

 Recent progress and trends in vertebrate paleontology, by W. D. Matthew. 

 Animals in the National Z<»ological Park, by N. Hollister. 

 The burrowing rodents of California as agents in soil formation, by Joseph 



Grinnell. 

 The natural history of China, by A. de C. Sowerby. 

 Life in the ocean, by Austin H. Clark, 



