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The article presents information related to the dust explosions produced in the experimental houses in the United States, which threaten nearly 28,000 industrial plants in the country. Engineers are now engaged in experimenting the ways to determine the proper venting area necessary to protect buildings of various sizes in industries subject to dust explosions. The products which yield explosive dusts include, grain, starch, sugar, wood, paper, fertilizer, and so on.

The article discusses the importance of proper heating, ventilation and lighting in every classroom. It describes how to achieve a proper degree of warmth and introduce much fresh air into a room. The size and design of the school building and its classrooms play an important part in achieving proper lighting. The color of the paint on walls and ceilings, the placement of the blackboards, and the quality of book paper and print should also be considered to prevent injuries to the eyesight.