CONTENTS. 



CHAPTEK IX. 



THE STARS. 



Distance of the stars Life and work of Bessel Studies of 

 Struve Life and work of Henderson Work of Peters, 

 Otto Struve, Brunnow, and Ball Measures of Gill 

 Parallax of first-magnitude stars Relative and absolute 

 parallax Work of Kapteyn Application of photography 

 Star- catalogues Argelander's 'Durchmusterung' Work 

 of Schonfeld Work of Gould The ' Cape Photographic 

 Durchmusterung ' Work of Gill and Kapteyn Interna- 

 tional chart of the heavens Work of Peck Proper 

 motions of the stars Star-drift Discoveries of Proctor 

 and Flammarion Radial motion Work of Huggins, 

 Vogel, and Campbell Solar motion . . .150 



CHAPTER X. 



THE LIGHT OF THE STARS. 



Work of Fraunhofer and Donati Life and work of Secchi 

 His types of spectra Life and work of Huggins 

 Photography of spectra Life and work of Vogel His 

 classification of spectra Work of Duner Of Pickering 

 Spectroscopic catalogues Analysis of spectra Stellar 

 photometry Life and work of E. C. Pickering Variable 

 stars Work of Goodricke Of Argelander, Schmidt, Heis, 

 Schonfeld Studies of Duner Of Gore Photographic 

 discoveries Classification Algol variables : their explan- 

 ation Explanation of other variables r\ Argus 

 Temporary stars Of 1848 Of 1866 Of 1876 Of 1885 

 Of 1892 Photographic discoveries Nova Persei, 1901 

 New star of 1903 Theories of temporary stars . .169 



