Daddy Takes Us Skating

Hal and Mab were so excited at hearing their father speak about a new secret, that they could hardly eat their supper. There were so many questions they wanted to ask. But they managed to clear their plates, and then, when Mr. Blake had on his slippers, and had put plenty of coal on the furnace, Hal climbed up on one knee, and Mab on the other. Daddy Blake went to the door, outside of which hung an instrument called a thermometer. A thermometer is a glass tube, fastened to a piece of wood or perhaps tin, and inside is a thin, shiny column. This column is mercury, or quicksilver. Some thermometers have, instead of mercury, alcohol, colored red, so it can easily be seen.