Myriads of individuals, each one unique, live out their lives in rapt intercourse with one another, contribute their heart's pulses to the universal music, and presently vanish, giving place to others. All this age-long sequence of private living, which is the actual tissue of humanity's flesh, I cannot describe. I can only trace, as it were, the disembodied form of its growth.

Chapter XIV: Neptune; Section 3, Slow Conquest (p. 211) - Last and First Men (1930)