108 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1921. 



consulted, especially reference works and the books of the aero- 

 nautical collection and the De Peyster collection. 



Bibliograj>hy . — The second volume of the Bibliography of Aero- 

 nautics, prepared by the assistant librarian, covering the period from 

 1909 to 191G, was completed and published by the National Advisory 

 Committee for Aeronautics. This volume contains approximately 

 35,000 citations and cross references, and supplements the material 

 contained in the volume published by the Smithsonian Institution 

 as volume 55 of the Smithsonian Miscellaneous Collections. The 

 aeronautical library is growing and becoming more and more im- 

 portant. 



MUSEUM LIBUARY. 



Continued interest has been manifested during the year in the 

 increase of the scientific collections of the United States National 

 Museum. Anions those who have donated valuable material to the 

 library may be mentioned Dr. J. M. Aldrich, Mr. H. S. Barber, Mr. 

 A. H. Clark, Dr. William H. Dall, Dr. O. P. Hay, Dr. W. H. Holmes, 

 Dr. Walter Hough, Dr. Ales Hrdlieka, Mr. W. R. Maxon, Dr. G. S. 

 Miller, Dr. C. W. Richmond, Mr. J. H. Riley, Mr. S. A. Rohwer, 

 Mr. W. Schaus, Mr. W. L. Schmitt, Dr. R. W. Schufeldt, Dr. L. 

 Stejneger, Mr. B. H. Swales, Dr. Charles D. Walcott, and the late 

 Dr. Joseph Paxson Iddings. 



Especially worthy of mention is the library of the late Doctor 

 Iddings, comprising upward of 1,000 books and pamphlets, chiefly 

 on geological subjects. Doctor Iddings, as is well known, was one of 

 America's leading penologists, and his 40 years' accumulation of 

 authors' excerpts on this branch of science was unusually large. 

 The donation, made through his sister, Mrs. Francis D. Cleveland, is 

 therefore important. Indeed it forms the most important single 

 acquisition to the geological section of the library since the founda- 

 tion of the department in 1880. 



The geological and paleontological collections have been further 

 augmented during the year by the continued gifts of the Secretary 

 of the Smithsonian Institution, Dr. Charles D. Walcott, most of the 

 books donated being volumes of highly technical content and of great 

 value to those undertaking advanced researches along these lines. 



The additions to the sectional library of the division of mollusks 

 through the gift of Dr. William H. Dall have made possible a con- 

 tinued study in the United States National Museum of the more re- 

 cently discovered mollusks and tertiary fossils. The library is greatly 

 indebted to Doctor Dall, during these times when scientific books of 

 this character are so expensive and so difficult to secure, for the con- 

 tinued interest year by year in the selection and presentation of so 



