110 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1921. 



aeronautical library is growing and becoming more and more im- 

 portant. 



MUSEUM LIBRARY. 



Continued interest has been manifested during the year in the 

 increase of the scientific collections of the United States National 

 Museum. Among 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 Hrdlicka, 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. H. B. Swales, Dr. Charles D. Walcott, and the late 

 Dr. Joseph Paxson Iddings. 



Especially worthy of mention is the library of the late Dr. Iddings, 

 comprising upward of 1,000 books and pamphlets, chiefly on geolog- 

 ical subjects. Dr. Iddings, as is well known, was one of America's 

 leading petrologists, and his 40 years' accumulation of authors' 

 excerpts on this branch of science was unusually large. The dona- 

 tion, 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 foundation 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 Dr. 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 

 many volumes for this section. The number of titles added this year 

 by Dr. Dall was 317. 



Accessions. — Four thousand seven hundred and sixty volumes were 

 accessioned during the year, including 2,041 completed volumes and 

 2,719 pamphlets. The number of books in the library is now 150,067, 

 of which 58,658 are bound volumes and 91,409 pamphlets and un- 

 bound papers. 



Cataloguing. — Seven hundred and seventy-seven volumes and 2,643 

 pamphlets were catalogued. 



