106. Sponge or spirit lamps are made for using the very inflammable spirit termed benzoline. They are filled with sponge or cotton wool which is moistened with benzoline, the wick-holder is then screwed on and the wick turned up level to the top; when lighted a small flame, rather greater than that of a candle, is produced. As the benzoline is very inflammable these lamps should never be trimmed after dark, near a fire, as the vapour may take light. If trimmed in the day-time, and only enough spirit poured in to moisten the cotton wool, they are quite safe, and are the cheapest source of a small light. When used as night lights they should always be placed under a chimney as the vapour escapes and smells when they are turned down low.