on put the dipper down, and then he could have it
without any difficulty. So he went on making houses in the sand, and in
a few minutes Nathan put the dipper down. Then, soon after, Rollo took
it up and put some dry sand into it, and he found that the sand would
run very smoothly, in a fine stream, through a small hole there was in
the bottom of it.

He determined to make an hour-glass of it. He had seen an hour-glass at
his uncle George's. It was made of glass, big at the bottom and at the
top, and narrow in the middle between the two. Through the narrow part
in the middle, there was a very small hole, to let the sand run down
through; and there was just sand enough put in to run through in an
hour. So that, if a person should set the sand to running, he would know
when an hour had expired, by observing when the sand had all run
through.

Rollo thought that he could make an hour-glass; and he thought it would
be a great convenience to him to have an hour-glass in the yard;
because it often happened, when he came out to play, that his mother
would tell him that he might stay out an hour; and then he had to go in
very often to look at the clock, in order to know exactly when the hour
had expired.

There were, however, so many little sticks and old leaves in the sand,
that it kept getting continually clogged up, and at last Rollo began to
get discouraged. He tried to pick out the little sticks; but he found he
could not do that, and at last it occurred to him that probably Dorothy
had some sand in the house that was cleaner.

He accordingly went in and asked her. She told him that he must wash his
own sand, and that would make it clean.

"But haven't you got some that is clean already?" said he.

"Yes," said Dorothy; "but you will like your hour-glass better if you
make it all yourself."

So Dorothy told him how to wash sand, for Rollo said that he did not
know. She said he must put a little in a basin, and then pump water into
it. "When the basin is nearly full of water, you must stir it round,
and then pour off the water, and pump in more;--do this until the water
comes off clear."

So Rollo took the basin which Dorothy gave him, and went out to his
sand-garden, and put in a little sand. Then he went to the pump, and
pumped water into it. Then he stirred it about with his hand. The water
immediately became very turbid, and a great many little sticks and
leaves came floating up to the surface. Rollo was surpris