hink? What is meant
by being under the _lee_ of a shore? What is a _squall_? What
indications did Jonas observe of the approach of the squall?
What course did he pursue in order to avoid the danger of it?

CHAPTER XII.

AIR AT REST.

A few days after the adventure described in the preceding chapter, Rollo
heard his father proposing to his mother that they should take a walk
the next morning before breakfast. Rollo wanted to go too. His father
said that they should be very glad to have his company; and he promised
to wake him in season.

Rollo felt rather sleepy, when his father called him the next morning;
but he jumped up and dressed himself, and was ready first of all. It was
a cool, but a very pleasant morning. The sun was just coming up. The
ground in the path before the door was frozen a little, and the air
seemed very still.

When Rollo's mother came out to the door, she said,--

"Well, husband, which way shall we go?"

"Up on the rocks," said Rollo; "let's go up on the rocks, mother. It
will be beautiful there this morning."

"Well," replied his mother; "we'll go up on the rocks."

The place which Rollo called the rocks, was the summit of a rocky hill,
which had a grassy slope upon one side, by which they could ascend, and
a precipice of ragged rocks upon the other. There was a very pleasant
prospect from the top of the rocks.

As they walked along, Rollo said that it was very different weather that
still morning, from what it was the day that he and Jonas were out upon
the pond.

"Yes," said his father, "you had an opportunity to see the effects of
air in motion then."

"And now _air at rest_," replied Rollo.

"Pretty nearly," said his father.

"Yes, sir, _entirely_," said Rollo; "there is no wind at all, this
morning: hold up your hand, and you can feel."

So Rollo stopped a moment upon the grass, and held up his hand to see
whether there was any wind.

"I know there is not any wind that you can perceive in that way," said
his father.

"How can we perceive it, then?" said Rollo.

"I'll tell you," replied his father, "when we get to the top of the
hill."

They reached the top of the hill soon after this, and sat down upon a
smooth stone. There was a very wide prospect spread out before
them,--fields, forests, hamlets, streams,--and here and there, scattered
over the landscape, a little patch of snow. The sun was just up, and the
whole scene was very bright and beaut