After taking cannabis, Dr. Clifford Pal awakens thousands of years in the future when America has been conquered by the Yuki, whereupon he falls in love with a princess, starts a revolution, and drinks more cannabis to return to the twentieth century.

We've got the evil Professor Tode (who modifies an atom-smasher into a time machine that travels to the Palaeolithic and to Atlantis), a fatherly older professor, his beautiful young daughter (menaced by evil Tode), casually written racist pronouncements (by Rousseau), and our hero scientist, the dashing Jim Dent. But my favorite sentence was the brief description of quantum mechanics, which I didn’t expect in a 1930 science fiction tale.