Our Cells
A string of young ducklings as they sidle along through grass beside a ditch—how like they are to a single serpent! I said in Life and Habit that a colossal being, looking at the earth through a microscope, would probably think the ants and flies of one year the same as those of the preceding year. I should have added:—So we think we are composed of the same cells from year to year, whereas in truth the cells are a succession of generations. The most continuous, homogeneous things we know are only like a lot of cow-bells on an alpine pasture.