Your teacher will take you to the basement to-day, if she can, and you will see the furnaces, the hot-air pipes, and the fresh-air shafts,—provided a furnace is used.

Be sure to ask questions about anything you do not understand.

Find out whether the school building is warmed by stoves, by hot air, by steam, or by hot water. If hot water or steam is used, notice whether or not fresh air gets into the building at the same time.

Your teacher will show you how the air comes in at the basement, how it goes up to each room, and how it then enters through the registers. Notice whether there are one or two large registers or several small ones in your schoolroom. Notice the same thing about the ventilators.

If there are no registers and no ventilators, your teacher will tell you how the room is ventilated.

If stoves do the heating, see if windows are open to let the air in, and notice whether they are open at the top or at the bottom.

Decide whether there are any dangerous drafts blowing across anybody.