EEPORT OF NATIONAL, MUSEUM, l'J20. . 45 



ment of the velocity of li^ht ; Edwin H. Hall : Theniud conductivity 

 of metals; C. Hart Merriam : Distribiitimi and villages of the Indian 

 tribes of the Klamath River region, California; John C. Merriam: 

 Siirnificance of correlation in function between the dentition and 

 skeleton of the fSabre-tooth tiger; George II. I*arker: On the colonial 

 nervous system of Kenilla ; Douglas H. Campbell : The genus Botry- 

 chium and its relationships; Frederick V. Coville: The influence of 

 cold in stimulating the growth of plants; Thomas B. Osborne and 

 Lafayette B. Mendel: Some common foods as sources of vitamines; 

 LaAvrence J. Henderson: The physico-chemical properties of haemo- 

 irlobin ; William A. Noves and George H. Coleman : The direct com- 

 bination of nitrogen and chlorine; Gilbert N. Lewis: Valance and 

 chemical affinity; William F. Durand : Shock or water ram in pipe 

 lines with imperfect reflection at the discharge end and including the 

 effect of friction and nonuniform change of valve opening; Leonard 

 E. Dickson: Recent notable progress in the theory of numbers; 

 Edward Kasner : Geodesies and relativity ; F, E. Pernot : The .use of 

 alternating currents for submarine cable transmission; George O. 

 Squier: Multiplex telephony and telegraphy over open-circuit bare 

 wires laid in the earth or sea; Lyman J. Briggs: The air resistance 

 of spheres; Robert H. Goddard : The possibilities of the rocket in 

 weather forecasting; H, Fielding Reid : The distribution of land and 

 water on the earth; AValdemar Lindgren : The alteration of lime- 

 stones in contract-metamorphism ; Henry Xorris Russell : Notes on 

 the internal constitution of the stars; Charles Greeley Abbot: New 

 observations on the variability of the sun. 



The following papers were read by title only : Raymond Pearl : 

 On a single numerical index of the age distribution of a population ; 

 Edward S. Dana: Biographical memoir of George Jarvis Brush; 

 Mabel Weil : Reports on the researches of the late Prof. C. C. Trow- 

 l)ridge {a) Auroras and magnetic disturbances (6) Auroral phe- 

 nomena and the meteor train zone {c) An investigation of meteor 

 trains (d) Theories on the nature of meteor trains. 



On May 17, 18 and 19, 1920, the American Association of Museums 

 held its fifteenth annual meeting in the National Museum. This 

 association had its origin in a meeting in the Museum in 1905, Avhen 

 the directors of nine prominent American nuiseums gathered here. 

 It was formally organized in New York City the following year, 

 and Avith a constantly increasing membership and well directed 

 efforts it has come to be recognized as an exceedingly important 

 factor in the advancement and direction of the museum movement 

 throughout the country. The meeting this spring afforded oppor- 

 tunity to learn of the changes and progress made during the strenu- 

 ous years since 1916, when the Association last met in AVashington, 



