surrounding walk. It undulated in the moonlight like a subsiding
storm, and beat the encircling banks. For into its depths shot
rather than poured a great volume of water from a huge orifice in
the wall, and the roar and the rush were tremendous. It was like the
birth of a river, bounding at once from its mountain rock, and the
sound of its fall indicated the great depth of the water into which
it plunged. Solid indeed must be the walls that sustained the
outpush of such a weight of water!

'You see now, cousin, what yon fire-souled slave below is labouring
at,' said his lordship. 'His task is to fill this cistern, and that
he can in a few hours; and yet, such a slave is he, a child who
understands his fetters and the joints of his bones can guide him at
will.'

'But, my lord,' questioned Dorothy, 'is there not water here to
supply the castle for months? And there is the draw-well in the
pitched court besides.'

'Enough, I grant you,' he replied, 'for the mere necessities of
life. But what would come of its pleasures? Would not the
beleaguered ladies miss the bounty of the marble horse? Whence comes
the water he gives so freely that he needeth not to drink himself?
He would thirst indeed but for my water-commanding fiend below. Or
how would the birds fare, were the fountains on the islands dry in
the hot summer? And what would the children say if he ceased to
spout? And how would my lord's tables fare, with the armed men
besetting every gate, the fish-ponds dry, and the fish rotting in
the sun? See you, mistress Dorothy? And for the draw-well, know you
not wherein lies the good of a tower stronger than all the rest? Is