8. Where the fly lays her little eggs and how they appear we already know, but how they hatch and how many survive of the countless numbers that are laid, we shall understand at once.

9. Most of these little eggs, which are laid on moist walls of houses or preferably in animal stalls or on rotting wood or some other moisture-holding mold, are safe, but the eggs blown away by the wind, of these only a very few hatch. Nevertheless, nothing is lost; instead it has another wise purpose, including those that are inhaled by man and beast, often amounting to millions, with just one breath. But let us leave those that are destined for another purpose and return to those that do hatch.