Geysers are now contrived so that the one apparatus will serve several taps, and circulators are fitted with concentric burners, so that when the water is hot the ring is put out and only the small inner burner used. Thermostats are fixed to reduce automatically the consumption of gas directly the water reaches a certain temperature. A cut-out system is also applied to existing cylinders and tanks of unnecessarily large size. When using a gas circulator the gas should be turned out when hot water is not required--a detail which many people forget. For example, one servant heats the water for baths, washing up and cleaning, then the gas is put out after lunch, and is not lighted again until hot water is wanted at night. Another keeps the gas burning the whole day. Gas for Lighting. When electricity is available, I should not choose gas as an illuminant, but when it must be employed it is now so arranged and shaded that the effect is perfect and the blacking of walls and ceiling reduced to a minimum. It may surprise some of my readers to know that gas can now be fitted so that it is switched on and off from a wall switch in the same fashion as electricity. Incandescent burners make for economy, and now _bijou_ burners are to be had suitable for small rooms, offices, etc., which consume less than the large burners. Allowing for gas at 3s. per 1000 feet, one large incandescent burner costs one penny every eight hours, a medium burner one penny for every twelve hours, and a _bijou_ one penny for every eighteen hours. Gas Fires. When choosing a gas fire see that there is a duplex burner, so that two or three jets can be turned out, leaving the centre jets burning. When the room is warm the smaller fire will suffice to keep it so. The best modern fires are noiseless and ventilated beautifully, and, as I have already said, they are really pleasing in appearance. Nevertheless, I do not advise a gas fire, however good, as an economy in a room which is used for hours at a time. The cost of an average fire is said to be 1¼d. per hour, counting gas at 3s. per 1000 feet, and it does not pay to burn 1¼d. worth of gas per hour for fourteen or fifteen hours at a stretch. From the point of view of money-saving it would be cheaper to burn coal. On the other hand, supposing a gas fire is lighted in a sitting-room in the morning, it can be turned out if the family are out in the afternoon, and not relighted until shortly before they return, for the advantage of gas and electric fires is that they are red-hot practically at once, whereas a coal fire takes time to burn up and become hot, and each time it is lighted it eats wood as well as coal.