CHAPTER VIII.
RADIATION AND CONDUCTION.
There are two ways by which the heat or the warmth of one body passes off to the other bodies around it. One is called radiation, the other conduction. Rollo learned the meaning of these terms, and the distinction between them, under the following circumstances:—
One pleasant morning, late in the autumn, Rollo’s father said that he was going away on some business, about fifteen miles, and he told Rollo’s mother that, if she would like to take a ride, he should be very glad to have her go too. She said that she should like to go very much, and she proposed that Rollo should go with them. Mr. Holiday had no objection to this arrangement, and accordingly Jonas was ordered to put both horses into the carryall, and bring it up to the front door.
“And, on the whole, Jonas,” said Mr. Holiday, “you may go with us too, and that will relieve me of all care of the horses.”
There were two seats to the carryall. Rollo sat with Jonas on the front seat, and his father and mother behind. They had a very pleasant ride in the forenoon, but at noon it looked rather cloudy, as if it might be going to rain. Rollo said he was afraid that it would rain before they should get home.
“No matter for that,” said Jonas.
“Why, then we shall get wet,” said Rollo.
“No matter for that,” said Jonas.
They were detained longer than they had expected to be at the place where Mr. Holiday had his business to do, so that it was rather late when they set out on their return home. After they had rode about an hour, it looked still more like rain, and at length, Rollo felt a little drop upon his cheek. He said, in a complaining tone,—
“There, Jonas, it is going to rain, for it begins to sprinkle now.”