VI CONTENTS. 



Miscellaneous: Page. 



Naples table 14 



Seal of the Institution 16 



Lunar photography 16 



Delegates to the universities and learned societies 17 



Assignment of rooms 17 



American Historical Association 17 



Stereotype plates and cuts 17 



Special correspondent in Paris IH 



Russian Physico-Chemical Society 18 



Correspondence IH 



United States National Museum and the Expositions in Madrid and Chicago. . • 19 



Bureau of Ethnology 22 



International exchanges 25 



United States National Zoological Park 27 



Astro-Physical Observatory 30 



Necrology , 33 



Appendices 35 



Appendix I. The U. S. National Museum 35 



II. Report of the Director of the Bureau of Ethnology 38 



III. Report of the Curator of Exchanges 45 



IV. Report of the acting Manager of the Niitional Zoological 



Park 54 



V. Report npou the Astro-Physical Observatory 60 



VI. Report of the Librarian 67 



VII. Report of the Editor *. 69 



(iENERAL APPENDIX. 



The Wanderings of the North Pole, by Sir Robert Ball 75 



The Great Lunar Crater Tycho, by A. C. Ranyard 89 



The Early Temple and Pyramid Builders, by J. Norman Lockyer 95 



Variable Stars, by Prof. C. A. Young 107 



The Luminiferous ^Ether, by Sir George G. Stokes 113 



Atoms and Sunbeams, by Sir Robert Ball 121 



Fundamental Units of Measure, by T. C. Mendenhall 135 



Photography in the Colors of Nature, hy F. E . Ives 151 



Photographs in Natural Colors, by Leon Warnerke 163 



Electric-Spark Photographs of Flying Bullets, by C. V, Boys 165 



Magnetic Properties of Liquid Oxygen, by Prof. Dewar 183 



The Problem of Flying, by Otto Lilienthal 189 



Practical Experiments in Soaring, by Otto Lilienthal 195 



Phenomena Connected with Cloudy Condensation, by John Aitken 201 



On Chemical Energy, by Dr. W. Ostwald 231 



The American Chemist, by Prof. G. C. Caldwell 239 



The Highest Meteorological Station in the World, by A. Lawrence Rotch 253 



The Mont Blanc Observatory 259 



Relations of Air and Water to Temperature and Life, by Gardiner G. Hubbard 265 



The Ice Age and its Work, by A. R. Wallace 277 



Geologic Time as Indicated by the Sedimentary Rocks of North America, by 



Charles D. Walcott \ 301 



The Age of the Earth, by Clarence King 335 



The Renewal of Antarctic Exploration, by .John Murray 353 



The North Polar Basin, by Henry Seebohm 375 



The Present Standpoint of Geography, by Clements R. Markham 395 



