It initially appeared as one third of the anthology Sometime, Never along with "Boy in Darkness" by Mervyn Peake and "Envoy Extraordinary" by William Golding.
Jane, a woman from the present day, has taken a drug called chuinjuatin, thought to induce out-of-body experiences.
A small educated elite, mainly in the medical profession, salvaged the catastrophe-stricken world, and devised a way for women to reproduce artificially.
They took inspiration from Chapter 6, verse 6 of the Book of Proverbs's "Go to the ant, thou sluggard; consider her ways, and be wise" and created a caste-based society.
The screenplay was written by Oscar Millard, and starred Barbara Barrie as the woman who travels through time and Gladys Cooper as the historian.