Tomorrow's Yesterday

Tomorrow's Yesterday, sometimes formatted as To-morrow's Yesterday, is a science fiction novel by English author John Gloag published by Allen & Unwin in 1932. A revised version was reprinted in First One and Twenty in 1946.
Tomorrow's Yesterday depicts a race of cat people from the distant future observing human society, which has reverted to barbarism after a destructive war. It was inspired by the work of H. G. Wells and Gloag's friend Olaf Stapledon, as well as Gloag's own experiences serving in the Welsh Guards during World [War I].