While the sunny side of the house is the best, and sunlight should be admitted (with few exceptions only) every day into the room, the sick person's eyes should not be exposed to a direct glare. The bed may be so turned that the window is out of the patient's sight; or, if this cannot be, a screen of some kind should be so placed as to shield his eyes from it. At times, when sleep is desirable, the light should be almost all shut out. At night, no flame of a lamp,- candle, or gas-burner should be exposed to the patient's view. Either should be shaded, or otherwise concealed. A gas-burner may, of course, be turned down ; and, besides, a movable tin burner-shade attached to it is a great convenience. Some persons, even when well, cannot sleep with the flame of ever so low-turned a gas-burner in their sight. It is not safe, moreover, to turn a gas-burner very low. A change of pressure at the source of supply may put out the light, and allow a leakage of gas, dangerous to any one sleeping in the room.