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VI

—Continued. Appendix I. Eeport on the National Museum 31

II. Report on the Bureau of American Ethnology 36

III. Eeport of the Curator of Exchanges 49

IV. Report of the Superintendent of the National Zoological Park 62 V. Report on the Astropbysical Observatory 69

VI. Report of the Librarian 75

VII. Report of the Editor 79

VIII. Report on the Tennessee Centennial Exposition 90

GENERAL APPENDIX.

Recent Progress accomplished by aid of Photography in the study of the

Lunar Surface, by MM. Loewy and Puiseux 105

The Function of Large Telescopes, by George E. Hale 123

The Le Sage Theory of Gravitation, by M. Le Sage, with Introduction by

S. P. Langley 139

The Extreme Infra-Red Radiations, by C. E. Guillaume 161

The Chemistry of the Stars, by Norman Lockyer 1 67

The Perception of Light and Color, by George Lechalas - 179

Some Curiosities of Vision, by Shelford Bidwell 197

Progress in Color Photography, by G. H. Niewenglowski 209

The Development of Electrical Science, by Thomas Gray 217

Telegraphy Across Space, by Silvanus P. Thompson 235

Signaling Through Space Without Wires, by W. H. Preece 249

Note on the Liquefaction of Hydrogen and Helium, by James Dewar 259

The Recently Discovered Gases and Their Relation to the Periodic Law, by

William Ramsay 267

The Kinetic Theory of Gases and Some of Its Consequences, by William Ram- say 277

The Revival of Inorganic Chemistry, by H. N. Stokes 289

Scientific Ballooning, by John M. Bacon 307

The Tundras and Steppes of Prehistoric Europe, by James Geikie 321

Modification of the Great Lakes by Earth Movement, by G. K. Gilbert 349

The Plan of the Earth and Its Causes, by J. W. Gregory 363

Funafuti: The Story of a Coral Atoll, by W. J. Sollas 389

Oceanography, by J. Thoulet 407

Tha Relation of Plant Physiology to the Other Sciences, by Julius Wiesner.. 427 Pithecanthropus erectus — A Form from the Ancestral Stock of Mankind, by

Eugene Dubois 445