VI CONTENTS. 



The Smithsonian Institution — Continued. Page. 



Library 20 



Correspondence 31 



International American Archteological Commission. 22 



International Congresses and Expositions 24 



Miscellaneoias 37 



National Museum 27 



Bxireau of American Ethnology . 30 



International Exchanges 31 



National Zoological Park 32 



Astrophysical Observatory 34 



Necrology 35 



Appendixes: 



I. Report on the United States National Museum 37 



II. Report on the Bureau of American Ethnolo;]^y 46 



III. Repoi't on the International Exchange Service .55 



IV. Report on the National Zoological Park _ 69 



V. Report on the Astrophysical Observatory. 78 



VI. Report of the Librarian 87 



VII. Report of the Editor 91 



VIII. Report of the Representative of the Smithsonian Institution and 

 National Museum, Louisiana Purchase Exposition, St. Louis, 



Mo., 1904 100 



GENERAL APPENDIX. 



Page. 



Experiments with the Langley Aerodrome, l)y S. P. Langley 113 



The Relation of Wing Surface to Weight, l)y R. Von Lendenfeld 127 



The Rumford Spectroheliograph of the Yerkes Observatory, by George E. 



Hale and Ferdinand Ellerman 131 



The Construction of large Telescope Lenses, by Dr. C. Faulhaber ........ 163 



Some Reflections Suggested by the Application of Photography to Astro- 

 nomical Research, by Prof. H. H. Turner 171 



Radiation in the Solar System, by J. H. Poynting 185 



Condensation Nuclei, by Prof. C. T. R. Wilson 193 



The Present Problems of Inorganic Chemistry, by Sir William Ramsay . . . 207 



The Evolution of the Scientific investigator, by Simon Newcomb 221 



Metals in the Atmosphere, by Prof. Alfred Ditte 235 



Observations on Vision in Brightness and in Obscurity, with a Hypothesis 



on the Cause of Color Blindness, by O. Lummer 249 



A Lightning Spiral observed near Basel, by Fr. Klingelfuss 259 



Variations of Specific Gravity, by Georg W. A. Kahlbaiam 261 



Some New Methods of Lighting, by A. Berthier 267 



The Progress in Wireless Telegraphy, by William Maver, jr 275 



Electric Welding Development, by Elihu Thomson _ 281 



The History of Some Discoveries in Photograpliy, by Robert Hunt 287 



Theories of Ore Depo.sitioii Historically Considered, by S. F. Emmons 309 



On Mountains and Mankind. l)y Douglas W. Freshfield 337 



Morocco, by Theol)ald Fischer 355 



The Work of the Reclamation Service, by F. H. Newell 373 



The Yuma Reclamation Project, by J. B. Lippincott 1 383 



The Evidence of Evolution, by Hugo De Vries 388 



