Schellen. Spectrum Analysis.
Thomson (Sir W., Lord Kelvin), Popular Lectures, etc. Lectures on the Tides, The Sun's Heat, etc.
Ball. Time and Tide. An exposition of the researches of G. H. Darwin upon tidal friction.
Gore. The Visible Universe. Deals with a class of problems inadequately treated in most popular astronomies.
Darwin. The Tides. An admirable elementary exposition.
Clerke. The System of the Stars. Stellar astronomy.
Newcomb. Chapters on the Stars, in Popular Science Monthly for 1900.
Clerke. History of Astronomy during the Nineteenth Century. An admirable work.
Wolf. Geschichte der Astronomie. München, 1877. An excellent German work.