Ah, modernism. These guys and gals just loved thinking about and playing with time. In Tropic of Cancer, Miller references everything from the prehistoric era to a future filled with robots. And he does it in a totally nonlinear way, flashing back without notice so we suddenly find ourselves lost in a story with no clue when we are. That, combined with his vague philosophical statements about time make for a hazy and almost hallucinatory story.
By dwelling so much on the past, Henry believes he can protect himself from the future.
In Tropic of Cancer, Henry Miller is trying to escape the bounds of time.