TABLE OF CONTENTS." 



5f 



PREFACE Page iii 



GENERAL SUMMARY OF PROGRESS xix 



A. MATHEMATICS AND ASTRONOMY (xix) 1 



(a.) MATHEMATICS. 



Pure Mathematics : Histon- of Logarithmic Tables, 24. Applied Math- 

 ematics. See Astronomy ; General Physics ; Geography. 



(b.) ASTRONOMY. 



Interstellar Space : On the Existence of a Resisting Medium in Space, 

 51. The Nebulas: Great Nebula in Argus, 30; Nebular Theory, 38. 

 The Stars : Heis' Star Atlas, 1 ; American Star Catalogue, 1 ; Newcomb's 

 Catalogue of Thirty-six Fundamental, 22 ; Argelander on Distribution of, 36 ; 

 Diameter of, 37 ; Faint Variable Stars and Asteroids, 60 ; Stellar Photome- 

 try, 58; Supposed Companion of Procyon, 25. The Solar System : Stock- 

 \vell on Stabilit}"- of, 38. The Sun : Apparent Variation in Diameter, 2, 

 41 ; its Spots, 3, 4, 40 ; Connection of Spots with INIagnetism and Auroras, 

 46, 47 ; with Temperature and Rain, 100, 123 ; its Crust, 52 ; Protuberances, 

 3,4,40; Constitution of, 42; its Atmosphere in General, 23 ; the Red Flames, 

 49 ; Spectral Phenomena, 40 ; do. of Limb and Centre, 45 ; its Temperature, 

 43 ; Daily Photographs, 60 ; Nature of Sunlight, 137 ; Solar Heat Reflected 

 from Lake Geneva, 155 ; Chemical Force of Solar Rays, 186. The Planets. 

 In General: Novel Relations among, 6; New Asteroids in 1873, 7, 49 ; Aster- 

 oids and Faint Variable Stars, 61 ; Urcmus : Moons of, 8 ; New Tables of, 17; 

 Saturn: Rings of, 61; Jupiter: Mass of, 7; Changes of Surface, 8; Orbit of, 

 22 ; Eclipse of Satellites, 50 ; Venus : Transit of, 9, 52 ; Earth : Rotation on 

 its Axis, 28; Mars: Schroeter on, 31 ; Kaiser on, 32; Vulcan: 61. The 

 Moon : White Appearances in, 8 ; Heat radiated from, 54 ; Influence on 

 Weather, 98. Meteoroids or Shooting-stars : Origin of, 9 ; Showers of 

 Nov. 27, 1872, 10 ; Meteor of June 17, 1873, 55 ; Altitude of, 55 ; an Incen- 

 diary Meteorite, 33 ; Meteoric Dust in Snow, 209. See also Meteorology. 

 Comets : Origin of, 9 ; Cometary Star Shower, 12 ; Biela's Comet, 10, 56, 

 59 ; New Comets, 33, 56. The Aurora : Foster's Theory of, 12 ; Aurora of 

 1872, and Ground Currents, 13 ; Connection with Magnetism and Sun Spots, 

 46, 47. Miscellaneous : Telegraphic Longitudes, 18 ; Measurement of an 

 Arc of the Meridian, 23,233 ; Exchange of Astronomical Discoveries by the 

 Atlantic Cable, 37 ; Amateur Astronomy in America, 2. Observatories and 



* lu the arrangement of articles in the body of the work, it was found to be difficult 

 to place them iu systematic sequence, especially as many of them belonged really un- 

 der more than one subject. The present systematic Table of Contents is intended to 

 remedy any misplacement, and bring together under one head all articles or para- 

 graphs belonging together, i-epeating the references when necessary. The references 

 in Roman letters preceding the page references of the respective headings relate to 

 the pages of the introductory "Summary." 



