ing the sacks. There is a wheel hanging
to the ceiling; the trap must be under that."

In a minute the trap was found, and raised. The smoke rushed up in
a volume, and the boys looked with dismay at the dense murk below.

"It's got to be done, Hugh. Tie that bit of sacking, quick, over
your nose and mouth, while I do the same. Now lower yourself by
your arms, and drop; it won't be above fifteen feet. Hold your
breath, and rush straight to the window. I heard them open it. Now,
both together now."

The lads fell over their feet, and were in another minute at the
window. The broad top of the great wheel stretched out level with
them, hiding the window from those who might have been standing
below. The wheel itself was some thirty feet in diameter, and was
sunk nearly half its depth in the ground, the water running off by
a deep tail race.

"We might lie flat on the top of the wheel," Hugh said.

"We should be roasted to death when the mill is fairly in flames.
No, Hugh; we must squeeze through this space between the wall and
the wheel, slip down by the framework, and keep inside the wheel.
There is no fear of that burning, and we shall get plenty of fresh
air down below the level of the mill.

"I will go first, Hugh. Mind how you go, for these beams are all
slimy; get your arm well round, and slip down as far as the axle."

It was not an easy thing to do, and Rupert lost his hold and
slipped down the last ten feet, hurting himself a good deal in his
fall. He was soon on his feet again, and helped to break the fall
of Hugh, who lost his hold and footing at the axle, and would have
hurt himself greatly, had not Rupert caught him, both boys falling
with a crash in the bottom of the wheel.

They were some little time before regaining their feet, for both
were much hurt. Their movements were, however, accelerated by the
water, which fell in a heavy shower from above, through the leaks
in the buckets of the wheel.

"Are you hurt much, Master Rupert?"

"I don't think I am broken at all, Hugh, but I am hurt all over.
How are you?"

"I am all right, I think. It's lucky the inside of this wheel is
pretty smooth, like a big drum."

The position was not a pleasant one. A heavy shower of water from
above filled the air with spray, and with their heads bent down it
was difficult to breathe. The inside planks of the wheel were so
slimy that standing was almost impossible, and at the slightest
attempt at movement they fe