And here it doth occur unto me that it was like enough to be a
plan for health, beside of training of the mind, that each youth
and maid was put to travel through all the cities of the Mighty
Pyramid; the which did take three years and two hundred and
twenty-five days, as I have told before this. For by this plan,
were they made to breathe the air of every height, and this,
mayhaps, unto the good of their developing. And they also to
discover that air which was best to their need.
And concerning the air of the Night Land, you shall know that
there was in all that Land no flying thing, because that the air
was grown very thin; yet, as the Records did show, there had once
been monstrous flying-brutes, that went over the Land in mighty
bounds; but this was in a long gone age; and
