The People That Time Forgot is an Edgar Rice Burroughs science fiction novel,
the second of his Caspak trilogy. The sequence was first published in Blue Book
Magazine as a three-part serial in the issues for September, October and
November 1918, with The People That Time Forgot forming the second installment.
The complete trilogy was later combined for publication in book form under the
title of The Land That Time Forgot (properly speaking the title of the first
part) by A. C. McClurg in June 1924. Beginning with the Ace Books editions of
the 1960s, the three segments have usually been issued as separate short
novels. The second of these is treated in this article.
The People That Time Forgot is a direct sequel to The Land That Time Forgot
and continues the lost world saga begun in the earlier story. Burroughs
continues the revelation of his lost world's unique biological system, only
hinted at in the previous installment, in which the slow progress of evolution
in the world outside is recapitulated as a matter of individual metamorphosis.
This system forms a thematic element serving to unite the three otherwise
rather loosely linked Caspak stories.