with the rough grinders, as we searched for the trout and crept up to
where we could see some good-sized, broad-tailed fellow sunning himself
till he caught sight of the intruders, and darted away like a flash of
light.

But Uncle Dick put a stop to our idling there, leading us back to the
road and insisting upon our continuing along it for another mile.

"I want to show you our engine," he said.

"Our engine out here!" I cried. "It's some trick."

"You wait and see," he replied.

We went on through the beautiful breezy country for some distance
farther, till on one side we were looking down into a valley and on the
other side into a lake, and I soon found that the lake had been formed
just as we schoolboys used to make a dam across a ditch or stream when
we were going to bale it out and get the fish.

"Why," I cried, as we walked out on to the great embankment, "this has
all been made."

"To be sure," said Uncle Dick. "Just the same as our little dam is at
the works. That was formed by building a strong stone wall across a
hollow streamlet; this was made by raising this great embankment right
across the valley here and stopping the stream that ran through it.
That's the way some of the lakes have been made in Switzerland."

"What, by men?"

"No, by nature. A great landslip takes place from the mountains, rushes
down, and fills up a valley, and the water is stopped from running
away."

We walked right out along what seemed like a vast railway embankment, on
one side sloping right away down into the valley, where the remains of
the stream that had been cut off trickled on towards Arrowfield. On the
other side the slope went down into the lake of water, which stretched
away toward the moorlands for quite a mile.

"This needs to be tremendously strong," said Uncle Jack thoughtfully, as
we walked on till we were right in the middle and first stood looking
down the valley, winding in and out, with its scattered houses, farms,
and mills, and then turned to look upward towards the moorland and along
the dammed-up lake.

"Why, this embankment must be a quarter of a mile long," said Uncle Jack
thoughtfully.

"What a pond for fishing!" I cried, as I imagined it to be peopled by
large jack and shoals of smaller fish. "How deep is it, I wonder?"

Did you ever know a boy yet who did not want to know how deep a piece of
water was, when he saw it?

"Deep!" said Uncle Dick; "that's easily seen. Deep as it is