REPORT OF THE SECRETARY. 121 



The seventeen-year locust, by R. E. Snodgrass. 



Entomology and the war, by L. O. Howard. 



Two types of southwestern cliff houses, by J. Walter Fewkes. 



On the race history and facial characteristics of the aboriginal Americans, by 



W. H. Holmes. 

 The opportunity for American archeological research in Palestine, by James 



A. Montgomery. 

 The differentiation of mankind into racial types, by Arthur Keith. 

 'The exploration of Manchuria, by Arthur de C. Sowerby. 

 The' origin and beginnings of the Czechoslovak people, by Jindfich Matiegka. 

 Geographic education in America, by Albert Perry Brigham. 

 Progress in national land reclamation in the United States, by C. A. Bissell. 

 Richard Rathbun, by Marcus Benjamin. 

 -A great chemist ; Sir William Ramsay, by Ch. Moureu. 



REPORT FOR 19 20, 



The complete vohime of the Annual Report of the Regents for 

 1920 was received from the Public Printer in May, 1922. 



j\.nnual Report of the Board of Regents of the Smithsonian Institution, show- 

 ing operations, expenditures, and condition of the Institution for the year 

 ending June 30, 1920. 704 pp., 230 pis., 105 text figs. (Publ. 2622.) 



The appendix contained the following papers: 



Studying the sun's heat on mountain peaks in desert lands, by C. G. Abbot. 



The habitability of Venus, Mars, and other worlds, by C. G. Abbot. 



Giant suns, by H. H. Turner. 



A bundle of meteorological paradoxes, by W. J. Humphreys. 



The determination of the structure of crystals, by Ralph W. G. Wyckoff. 



Dr. Aston's experiments on the mass spectra of the chemical elements, with 

 introduction by C. G. Abbot. 



Vitamins, by W. D. Halliburton. 



:Soil acidity — its nature, measurement, and relation to plant distribution, by 

 Edgar T. Wherry. 



The chemistry of the earth's crust, by Henry S. Washington. 



Major causes of land and sea oscillations, by E. O. Ulrich. 



The Bryozoa, or moss animals, by R. S. Bassler. 



The horned dinosaurs, by Charles W. Gilmore. 



Rhythm in nature, by F. W. Flattely. 



Parasitism and symbiosis in their relation to the problem of evolution, by 

 Maurice Caullery. 



T^ocal suppression of agricultural pests by birds, by W. L. iNIcAtee. 



The occult senses in birds, by Herbert H. Beck. 



Adventures in the life of a tiddler crab, by O. W. Hyman. 



The senses of insects, by N. E. Mclndoo. 



The resplendent shield-bearer and the ribbed cocoon-maker: Two insect in- 

 habitants of the orchard, by R. E. Snodgrass. 



The origin of insect societies, by Auguste Lameere. 



The botanical gardens of Jamaica, by William R. Maxon. 



Daturas of the old world and new: An account of their narcotic properties 

 and their use in oraculai- and initiatoi'y ceremonies, by William E. Safford. 



Effect of the relative length of day and night on flowering and fruiting of 

 plants, by W. W. Garner and H. A. Allard. 



"Fire worship of the Hopi Indians, by J. Walter Fewkes. 



