VI CONTENTS. 



The Smithsonian Institution — Continued. Page. 



Explorations 8 



Publications 8 



Library 10 



Hodgkins fund 10 



Avery fund 11 



Smithsonian Half-Century Memorial 12 



Correspondence 14 



Miscellaneous : 



Naples table 14 



Art collection 15 



Atlanta Exposition 15 



International Zoological Congress 16 



The Smithson Memorial Tablets 16 



American Historical Association 16 



"United States National Museum 16 



Bureau of American Ethnology 19 



International Exchange Service 21 



National Zoological Park 22 



Astrophysical Observatory 26 



Necrology L 27 



Appendixes : 



Appendix I. The United States National Museum 29 



II. Eeport of the Director of the Bureau of Ethnology 32 



III. Eeport of the Curator of Exchanges 46 



IV. Report of the Superintendent of the National Zoological 



Park 61 



V. Report upon the Astrophysical Observatory 68 



VI. Report of the Librarian 74 



VII. Report of the Editor 75 



GENERAL APPENDIX. 



The Problems of Astronomy, by Simon Newcomb 83 



Tbe Investigations of Hermann Von Helmholtz on the Fundamental Principles 



of Mathematics and Mechanics, by Leo Koenigsberger 93 



Physical Phenomena of the Upper Regions of the Atmosphere, by Alfred 



Cornu 125 



New Researches on Liquid Air, by Professor De-war 135 



Meteorological Observatories, by Richard Inwards 149 



Color Photography by Means of Body Colors, and Mechanical Color Adapta- 

 tion in Nature, by Otto Wiener 167 



Present Status of the Transmission and Distribution of Electrical Energy, by 



Louis Duncan 207 



The Utilization of Niagara, by Thomas Commerford Martin 223 



Earth-Crust Movements and Their Causes, by Joseph Le Conte 233 



The Physical Geography of Australia, by J. P. Thomson 245 



Arctic Explorations, by A. H. Markham 273 



The Animal as a Prime Mover, by R. H. Thurston 297 



Recent Advances in Science, and their Bearing on Medicine and Surgery, by 



Michael Foster ." 339 



Ludwig and Modern Physiology, by J. Burdon- Sanderson 365 



