Whenever these three signs are present, without some clear cause, such as a cold, or unusual overwork or strain, especially if they be accompanied by a rapid pulse and a tendency to get out of breath readily in running upstairs, they should make us suspect tuberculosis; and if they keep up, it is advisable to go at once and have the lungs thoroughly examined.

Nine cases out of ten, seen at this stage, are curable--many of them in a few months.
Even if we should not have the disease, if we have these symptoms we need to have our health improved; and a course of life in the open air, good feeding, and rest, which would cure us if we had tuberculosis, will build us up and prevent us from developing it.
[Illustration: AN OUTDOOR CLASSROOM FOR TUBERCULOUS CHILDREN The roof and the side awnings are the only obstructions to the outer air.] PNEUMONIA Its Cause and Prevention.

The other great disease of the lungs is _pneumonia_, formerly known as inflammation of the lungs.

This is rapid and sudden, instead of slow and chronic like tuberculosis, but kills almost as many people; and unfortunately, unlike tuberculosis, is not decreasing.

In fact in some of our large cities, it is rapidly increasing.