Perfumes sweet, Colors gay Come from coal-tar Every day. The reading up of the subject, keeping it in mind until a means of expressing i t graphically is found, and condensing many words into a forceful title, all these surely have their educational value. The posters with their bold printing and colorful drawings certainly add t o the attractiveness of the class-room. I hope that teachers will feel that the suggestions offered here are worth trying and that it will brighten up things to "Say it with posters." f.
Flame Burned under Water Saves Fuel. Burning an oil flame under water for weeks a t a time, and avoiding most of the heat loss of an ordinary boiler, is the feat of Oscar Brunler, a Belgian scientist. Bv means of a device similar t o a carburetor,. a surav . . of crude oil mixed with air is blown into the burner under pressure. Water is kept out of the burner until it is hot and the fire is buminp- well. Then the water is allowed t o rise around the flame until i t is submerged. Once started it can be kept burning for months. All designs of boilers are hased on the principle of bringing the flame of the fuel into the closest possible contact with the water in order to avoid loss of heat. The most efficient method is t o have the flame directly in the water, and this is what Brunler has succeeded in doing. His success is shown by his report to the Society of Chemical Industry. More than sixty different kinds of oil have been burned and boilers have worked continuously 4 for months. The flame can be regulated completely by turning one wheel. While an ordinary burner seldom gives as much as 75 per cent of the heat, as determined b y common methods of analysis, this submerged flame has given a heat efficiency of practically 100 per cent for weeks a t a time.-Science Sewice PREPARING CHEMICAL EXPOSITION DIRECTORY An industrial directory of exhibitors in the Tenth Exposition of Chemical Industries. which will be held in New York a t the Grand Central Palace during the week of Sept. 28th t o Oct. 3rd, is now being compiled under the direction of the Exposition management. The directory will be arranged according t o the numerous consuming groups, listing products, and equipment sold t o each group by exhibitors. The compilation will cover all chemical process materials and machinery and the industries for which they are available. Under each product or group will be listed the various exhibitors. who manufacture the article in question with any particular information about the individual products of the different manufacturers. The Chemical Exposition directory will be compiled primarily to help buyers who come to the Exposition in search of various materials or equipment. It is believed that it will be particularly valuable t o foreign buyers who are not acquainted with the names. of the American manufacturers or with their products. The volume when completed is expected t o make several thousand pages which will preclude its being printed for general distribution to visitors. It will he made up in loose-leaf form and held by themanagement far consultation when inquiries are received as t o sources of supply a t the. Exposition.
