Disease germs are of two kinds. One kind belongs to the plant kingdom and the other to the animal kingdom. These disease germs are so small that even the eyes cannot see them. Most of them are so small that when they are magnified one-thousand time by a microscope, they appear as large as a mustard seed.
Disease germs multiply very fast. Under favourable conditions a single a of the germs that produce cholera or typhoid fever can, in tens hours time, give rise to a million others. Sin they are so small and multiply so fast, they are widely distributed. They are found in the water of wells, rivers and ponds, in the dust of the street and in the dust on the floors and walls of houses, and even in the foods we eat and the liquids we drink. It may be said that in thickly populated places disease producing germs are found everywhere. Since this so, everyone should learn how to keep these germs out of the body, and how to destroy them.
