AUTHOR-SUBJECT INDEX, 1849-1961 



Pettengill, and E. M. McCormick's description of the marvelous 

 operations of modern digital computers. 



The entire series of Reports include some 3,000 articles, many of 

 them written by world leaders in the various branches of science. 

 It is the hope of the Smithsonian Institution that the present author- 

 subject index will lead to a wider acquaintance with the diversified 

 scientific source material in Smithsonian Annual Reports covering 

 113 years. 



Leonard Carmichael, 

 Secretary, Smithsonian Institution. 



