Damon Knight published two dozen reprint anthologies from the early 1960s through 1975 (as well as the influential Orbit series of original anthologies, from 1966 to 1980). His first anthology was one of several of substantial scope, coming at a time when SF was gaining a bit of literary respect, and genre historians were claiming SF antecedents as far back as Plato and Homer. With excerpts from 19th century works by Wells and Verne, this is Knight's first take on the history of science fiction.
(Page numbers below are taken from the 1963 paperback edition.)