We try to make a Map--The Stars are Suns--The Numbers of the
Stars--The Clusters of Stars--The Rank of the Earth as a Globe
in Space--The Distances of the Stars--The Brightness and Color
of Stars--Double Stars--How we find what the Stars are made
of--The Nebulæ--What the Nebulæ are made of--Photographing the
Nebulæ--Conclusion.