Birth and death are activities always present in man's body. Every minute cells are born, and every minute cells die.

The process going on is building up and breaking down. This process means that new material must be brought in and made into new cells, and that the old cells must be broken down and removed. To accomplish this, Two Ferments are required; namely, unorganized ferment (enzyme) and organized ferment (bacterium). The organized has received attention in a previous chapter.

It is my desire that the readers of this book look upon bacteria as beneficial rather than as enemies to man.

At the very genesis of this process--namely, bringing food to a state of solution, fitting it for absorption--there must be some plan for preparing material for cell building; and there is. The material must be dissolved, and from the time food enters the mouth until it is a living cell it is accompanied at every step of its progress by refining elements called enzymes. The enzymes--from those in the mouth, stomach, and bowels to those that kiss life and mind into a finished brain cell--are graduated and fitted for their special purposes; and so subtile and varied are they in their work that they are a constant surprise to medical scientists. To show how the learned men of the profession are surprised at the mysterious subtilty of some of the finer ferments, enzymes, I take pleasure in reproducing one of my recent articles from "Philosophy of Health":