Bergsonian "vitalism" challenged the dominance of Spencerian determinism in the early twentieth century and seemed to offer a new foundation for belief in human freedom and individual possibility. Quirk traces the impact of Bergsonism upon the American sensibility and shows how individual writers -- particularly two such different artists as Willa Cather and Wallace Stevens -- appropriated vitalistic notions and made them serve the peculiar requirements of their own unique creative imaginations. Originally published in 1990. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.