' EEPORT OF THE SECRETARY. 19 



tory. As secretary of the Smithsonian Institution, I was appointed 

 a member of the National Advisory Committee and elected chairman 

 of its executive committee, and in this connection I have been able 

 to cooperate toward the solution of many important problems per- 

 taining to the science and art of aviation. One of the chief advan- 

 tages already being realized by the establishment of the advisory 

 committee is a closer cooperation between the Army and Navy and 

 other Federal departments and coordination of work in the general 

 advancement of aviation. The Institution published during the year 

 two pamphlets on aeronautics, one, a series of reports on wind 

 tunnel experiments, and the other on "Dynamical stability of aero- 

 planes," both of them by J. C. Hunsaker and associates. 



PUBLICATIONS. 



The publications of the Institution proper include three series: 

 Smithsonian Contributions to Knowledge; Smithsonian Miscellan- 

 eous Collections; and Smithsonian Annual Reports. Under the di- 

 rection of the Institution there are also issued the Annual Reports, 

 Proceedings, and Bulletins of the United States National Museum, 

 including the Contributions from the National Herbarium; Annual 

 Reports and Bulletins of the Bureau of American Ethnology; and 

 the Annals of the Astrophysical Observatory. All of these series 

 except the " Contributions " and " Collections " are printed through 

 annual Congressional allotments. In all of these series there was pub- 

 lished during the year a total of 8,498 pages and 623 plates of illus- 

 trations. 



Smithsonian Contributions to Knowledge. — This series is intended 

 to show results of original research constituting important contribu- 

 tions to knowledge. One memoir of the series was in press at the 

 close of the year giving the results of an extended study on the com- 

 paratiA^e histology of the femur. 



Smithsonian Miscellaneous Collections. — ^Twenty-two papers, 

 forming parts of five volumes of this series, were issued, among them 

 three papers on Cambrian geology by your secretary. In this series 

 the annual exploration pamphlet was issued, giving brief accounts 

 of the explorations and field work of the Institution in geology, 

 biology, and anthropology, covering every continent on the globe, 

 and illustrated by 141 photographs taken in the field by the scien- 

 tists themselves. The Smithsonian Physical Tables, which together 

 with the Mathematical and GeographicaJ Tables have become stand- 

 ard works of reference in educational and research institutions, are 

 published in this series. The sixth revised edition of the Physical 

 Tables, issued during the preceding year, was quickly exhausted, 

 making it necessary to print additional copies. Still another edition 

 is now in press, indicating the constant demand for this work. 



