CONTENTS. 



Letter from the Secretary submitting the Anuual Report of the Regents to 



Congi'ess iii 



Contents of the report v 



List of plates vii 



General subjects of the annual report ix 



Officials of the Institution and its branches xi 



REPORT OF THE SECRETARY. 



The Smithsonian Institution 1 



The Establishment 1 



The Board of Regents 1 



Finances 2 



The Freer Art Gallery 4 



Researches and explorations — 



Geological explorations in the Rocky Mountains 5 



Mastodon from Indiana 7 



Paleontological and stratigraphic studies in the Paleozoic rocks 7 



Explorations in Siberia 8 



Collecting fossil echinoderms in the Ohio Valley 9 



Geological work in Pennsylvania and Virginia 9 



Expedition to Borneo and Celebes 10 



Explorations in China and Manchuria 10 



Explorations in eastern Siberia 10 



Expedition to St. Thomas, Danish West Indies 11 



Cactus investigations in Brazil and Argentina 11 



Fog-clearing investigations 13 



Explorations of ancient Maya cities in Guatemala and Honduras 13 



Study of nocturnal radiation 14 



Researches under Harriman trust fund 16 



Research Corporation , 16 



National Research Council 16 



Langley Aerodynamical Laboratory 18 



Publications 19 



Library 21 



International congresses and expositions: 



Second Pan American Scientific Congress 22 



Nineteenth International Congress of Americanists 23 



Panama- Pacific International Exposition 24 



Panama-California Exposition at San Diego 26 



National Museum 26 



v 



