This is a good introduction to the Science Fiction genre. Damon Knight, the editor, has selected stories from the nineteenth and twentieth centuries and grouped them thematically. Thus there are sections for "Robots", "Time Travel", "Space", "Other Worlds and People", "Aliens among Us", "Superman"(not the 'Man of Steel'), and "Marvelous Inventions". Most of the selections are short stories from classic SF authors like Alfred Bester, Philip Jose Farmer, Robert Heinlein, Arthur C. Clarke, Marion Zimmer Bradley, and Poul Anderson. However there are some excerpts that highlight great novels including Twenty Thousand Leagues Under the Sea by Jules Verne, Odd John by Olaf Stapledon, and The Time Machine by H. G. Wells. The result of these selection and others is a satisfying anthology of the most imaginative fiction offered over the century ending in the 1960s. A special plus is the inclusion of an introduction by the editor and a bibliography of selected readings for readers who are inspired to seek out more science fiction.