2
01 - The Windows of Absolute Night
3
02 - Star-Clouds, Star-Clusters, and Star-Streams
5
04 - The Passing of the Constellations
6
05 - Conflagrations in the Heavens
7
06 - Explosive and Whirling Nebulae
8
07 - The Banners of the Sun
9
08 - The Zodiacal Light Mystery
10
09 - Marvels of the Aurora
11
10 - Strange Adventures of Comets
12
11 - Meteors, Fire-Balls, and Meteorites
13
12 - The Wrecking of the Moon
14
13 - The Great Mars Problem
15
14 - The Riddle of the Asteroids