Every cell of the human body contains within its nucleus a group of forty-six chromosomes. The chromosomes contain genes which determine heredity. The genes are composed of DNA (deoxyribonucleic acid), the marvelous protein substance which controls the form and function of the cells and tissues of this particular individual so that they harmonize with his hereditary pattern. The DNA molecules function like...

The passing on of life from parent to child is one of the greatest privileges that come to men and women. Seeing one's children grow and develop is one of life's great satisfactions. A parent delights in the observation that his child is like himself. With the privilege of parenthood comes responsibility for the child's welfare. A-parent's care of the child does much to determine how strong...