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998. Oil Lighting. Whenever oil, whether animal, vegetable, or mineral, is used for the purpose of artificial light, it should be kept free from all exposure to atmospheric air; as it is apt to absorb considerable quantities of oxygen. If animal oil is very coarse or tenacious, a very small quantity of oil of turpentine may be added. 999. Improving Candles. Candles improve by keeping a few months. If wax candles become discoloured or soiled, they may be restored by rubbing them over with a clean flannel slightly dipped in spirits of wine. 1000. Lighting Candles. In lighting candles always hold the match to the side of the wick, and not over the top of it, as is generally done. 1001. Night Lights. Field's and Child's night lights are generally known and are easily obtainable. But under circumstances where they cannot be procured, the waste of candles may be thus applied. Make a fine cotton, and wax it with white wax. Then cut into the requisite lengths. Melt the grease and pour into pill boxes, previously either fixing the cotton in the centre, or dropping it in just before the grease sets. If a little white wax be melted with the grease, all the better. In this manner, the ends and drippings of candles may be used up. When set to burn, place in a saucer, with sufficient water to rise to the extent of the 16th of an inch around the base of the night light. 1002. Revolving Ovens.