. . .a summary of the important rudiments of astronomy and related sciences"" for school and amateur use, systematically arranged. From a discussion of the universe, it goes on to detailed descriptions of telescopes, spectroscopes, photography and the individual planets, stars, comets, tides, to atoms, matter and energy, relativity, radiation, light, sound, etc., and traces historical findings and thinking to present day discoveries. There are sky maps and definitions and facts for handy reference. Not easy a b c presentation, but good material for intelligent beginners.