As one walks through the streets of every large city, he sees the dull and vacant eye, the inert face, of the mouth-breather; for, as every physician well knows, the mouth-breather suffers from lack of memory and a general dullness of the intellect. Not only that, but he habitually submits himself to unnecessary risks of disease. In breathing through the nose, the disease germs, which abound in our city streets and are sent floating through the air by every passing wind, are caught by the gluey mucus or the capillaries of the mucous membranes. The wavy air passages of the nose lead one to assume that they are so constructed expressly for this purpose, as the germs, if they escape being caught at one angle, are pretty sure to be trapped in turning another. When this mucus is expelled in the act of “blowing the nose,” the germs go with it, and disease is prevented. But when these germs are taken in through the mouth, they go directly into the throat, the bronchial tubes, and the lungs, and if they are lively and strong, they lodge there and take root and propagate with such fearful rapidity that in a very short time a new patient with tuberculosis, diphtheria, typhoid, or some other disease, is created. Hence, emulate the Indian. Breathe through your nose; do not use it as an organ of speech. At the same time that you care for yourself, watch your children, and even if you have to bandage them up while they are asleep, as the Indians do, compel them to form early this useful and healthful habit of nasal breathing. [Illustration: INDIAN SHOWING EFFECT OF DEEP BREATHING IN WONDERFUL LUNG DEVELOPMENT].