This is the heaviest drain on the gas. In the Caddo field in Louisiana alone the loss is seventy million cubic feet per day, enough to light ten cities the size of Washington, D. C., and equal to ten thousand barrels of petroleum per day. In Indiana a few years ago fourteen wells, all within a space of a few acres in extent, were burned by oil drillers continuously for six months, the light being visible twenty miles away. Greater care in the management of the wells and slight additional expense for casing are all that is required to stop the waste of gas from oil wells and heavy pressure gas wells. All of these wastes taken together constitute a fearful loss. In 1907, more than 400,000,000 cubic feet were used and an almost equal number wasted. In other words, the daily waste is over a billion cubic feet, or enough to supply every city in the United States of over one hundred thousand population. The heating value of a billion feet of gas is equal to a million bushels of coal. If some great conflagration were sweeping away our coal fields steadily every day in the year, and destroying our best coal at the rate of a million bushels per day, how quickly we should all arise to aid in checking it! And yet this imaginary case is actually true in regard to the best fuel in this country, which is burning uselessly an equal value in coal, and our coal must some day be used to supply the loss. We are apt to ignore the greatness of this loss because the gas escapes into the air and we can not see it, or it burns and we see only its effect, not the loss of fuel, but if we could see it in the form of oil we should find that a billion feet of gas is equal to more than a hundred and sixty thousand barrels of petroleum. Think of it, the equivalent of one hundred and sixty thousand barrels of oil, for which no price is paid and of which no use is made, for ever destroyed every day in every year! Would the oil companies permit it? Would we not all assist them in saving their property from destruction, and shall we not ask of them equal help in saving the fuel that in turn conserves our coal supply? Little objection can be made to the present method of using gas in the older regions. The waste in domestic use is comparatively small. Much is used for lighting with incandescent burners, and asbestos grates and gas ranges have replaced the open-burner stoves and grates. These are all efficient methods of use, and but little could be done in the way of further conservation. In factories the gas-engine is in many instances replacing the open furnace, which requires many times as much gas to produce an equal amount of power. They should be used in every factory, and gas companies should also require the use of the best devices for saving gas in places where meters are not used.