Three or four hours of real cold will make ice enough for that.
"Come, Nathan, jump on the sled, and you shall have a ride.

Rollo and I will be your horses.

Mother will have supper ready by the time we get home." Nathan, glad of a ride, took his seat, and they were soon at the house.
Oliver took the snow-shovels and the other tools, and returned them to their proper places, and then drew up his sled into a corner of the wagon-house.
After tea, Oliver and Rollo went out into the yard to feel the air, and judge of the impression the night would probably make upon "Iceberg Castle" and its inhabitants.
It was clear and cold.

The stars twinkled brightly.

The moon was not up.
"See there!" said Oliver; "I do believe they are building a fire down on the pond already.