make another, it shall do its work that thou wouldst not hear it
outside the door. Now listen to me for a moment, cousin. Should it
come to a siege and I not at Raglan--the wise man will always
provide for the worst--Caspar will be wanted everywhere. Now this
engine is essential to the health and comfort, if not to the
absolute life of the castle, and there is no one at present capable
of managing it save us two. A very little instruction, however,
would enable any one to do so: will you undertake it, cousin, in
case of need?'

'Make me assured that I can, and I will, my lord,' answered Dorothy.

'A good and sufficing answer,' returned his lordship, with a smile
of satisfaction. 'First then,' he went on, 'I will show you wherein
lies its necessity to the good of the castle. Come with me, cousin
Dorothy.'

He led the way from the room, and began to ascend the stair which
rose just outside it. Dorothy followed, winding up through the
thickness of the wall. And now she could not hear the engine. As she
went up, however, certain sounds of it came again, and grew louder
till they seemed close to her ears, then gradually died away and
once more ceased. But ever, as they ascended, the rushing sound
which had seemed connected with it, although so distant, drew nearer
and nearer, until, having surmounted three of the five lofty stories
of the building, they could scarcely hear each other speak for the
roar of water, falling in intermittent jets. At last they came out
on the top of the wall, with nothing between them and the moat below
but the battlemented parapet, and behold! the mighty tower was
roofed with water: a little tarn filled all the space within the