CARBON DIOXIDE.

The article discusses on the best and easiest way to determine the presence of carbon dioxide in a school building and how to find carbon monoxide is present. A person can make a qualitative test by aspirating or by forcing some of the air through a clear solution of lime water. Meanwhile, the most practical way to determine the proportion is the method by which ten thousand parts of air are aspirated through a battery of three or four long U-tubes filled with caustic potash and glass beads.