The seeds of time.

Of course you have read "Triffids", "Chrysalids" and "Midwich", and while this short story collection doesn't reach the heights of Wyndham's classics, it still delivers many morsels of his brilliance. I read it at school in the 1970s, and returning to it in 2022 it was striking how some of the stories had stayed with me, especially "Survival" and "Pawley's Peepholes".